diff --git a/.changelog/fix-builder-accessor-naming.md b/.changelog/fix-builder-accessor-naming.md
new file mode 100644
index 00000000000..9219e9dc6e0
--- /dev/null
+++ b/.changelog/fix-builder-accessor-naming.md
@@ -0,0 +1,9 @@
+---
+applies_to: ["client", "server"]
+authors: ["haydenbaker", "nated0g"]
+references: ["smithy-rs#4338"]
+breaking: false
+new_feature: false
+bug_fix: true
+---
+Fix builder accessor methods to use symbol provider for naming. This resolves conflicts when struct members are renamed due to reserved words (e.g., `meta` -> `meta_value`), ensuring setter and getter methods use the correct renamed field names.
diff --git a/aws/codegen-aws-sdk/src/main/kotlin/software/amazon/smithy/rustsdk/SmokeTestsDecorator.kt b/aws/codegen-aws-sdk/src/main/kotlin/software/amazon/smithy/rustsdk/SmokeTestsDecorator.kt
index dd2891a3b8b..08426ae24b9 100644
--- a/aws/codegen-aws-sdk/src/main/kotlin/software/amazon/smithy/rustsdk/SmokeTestsDecorator.kt
+++ b/aws/codegen-aws-sdk/src/main/kotlin/software/amazon/smithy/rustsdk/SmokeTestsDecorator.kt
@@ -154,7 +154,7 @@ class SmokeTestsBuilderKindBehavior(val codegenContext: CodegenContext) : Instan
     override fun hasFallibleBuilder(shape: StructureShape): Boolean =
         BuilderGenerator.hasFallibleBuilder(shape, codegenContext.symbolProvider)
 
-    override fun setterName(memberShape: MemberShape): String = memberShape.setterName()
+    override fun setterName(memberShape: MemberShape): String = memberShape.setterName(codegenContext.symbolProvider)
 
     override fun doesSetterTakeInOption(memberShape: MemberShape): Boolean = true
 }
diff --git a/aws/codegen-aws-sdk/src/main/kotlin/software/amazon/smithy/rustsdk/endpoints/OperationInputTestGenerator.kt b/aws/codegen-aws-sdk/src/main/kotlin/software/amazon/smithy/rustsdk/endpoints/OperationInputTestGenerator.kt
index 8d515e9bcc7..16c0448b098 100644
--- a/aws/codegen-aws-sdk/src/main/kotlin/software/amazon/smithy/rustsdk/endpoints/OperationInputTestGenerator.kt
+++ b/aws/codegen-aws-sdk/src/main/kotlin/software/amazon/smithy/rustsdk/endpoints/OperationInputTestGenerator.kt
@@ -186,7 +186,7 @@ class OperationInputTestGenerator(_ctx: ClientCodegenContext, private val test:
             testOperationInput.operationParams.members.forEach { (key, value) ->
                 val member = operationInput.expectMember(key.value)
                 rustTemplate(
-                    ".${member.setterName()}(#{value})",
+                    ".${member.setterName(ctx.symbolProvider)}(#{value})",
                     "value" to instantiator.generate(member, value),
                 )
             }
diff --git a/codegen-client/src/main/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/ClientBuilderInstantiator.kt b/codegen-client/src/main/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/ClientBuilderInstantiator.kt
index 15911fbcd0b..c1e4cfa5b5e 100644
--- a/codegen-client/src/main/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/ClientBuilderInstantiator.kt
+++ b/codegen-client/src/main/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/ClientBuilderInstantiator.kt
@@ -15,6 +15,7 @@ import software.amazon.smithy.rust.codegen.core.rustlang.rustTemplate
 import software.amazon.smithy.rust.codegen.core.rustlang.writable
 import software.amazon.smithy.rust.codegen.core.smithy.generators.BuilderGenerator
 import software.amazon.smithy.rust.codegen.core.smithy.generators.BuilderInstantiator
+import software.amazon.smithy.rust.codegen.core.smithy.generators.setterName
 
 class ClientBuilderInstantiator(private val clientCodegenContext: ClientCodegenContext) : BuilderInstantiator {
     override fun setField(
@@ -25,6 +26,10 @@ class ClientBuilderInstantiator(private val clientCodegenContext: ClientCodegenC
         return setFieldWithSetter(builder, value, field)
     }
 
+    override fun setterProvider(field: MemberShape): String {
+        return field.setterName(clientCodegenContext.symbolProvider)
+    }
+
     /**
      * For the client, we finalize builders with error correction enabled
      */
diff --git a/codegen-client/src/main/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/ClientInstantiator.kt b/codegen-client/src/main/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/ClientInstantiator.kt
index 992d85dd72a..e9edecb7ea3 100644
--- a/codegen-client/src/main/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/ClientInstantiator.kt
+++ b/codegen-client/src/main/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/ClientInstantiator.kt
@@ -23,7 +23,7 @@ class ClientBuilderKindBehavior(val codegenContext: CodegenContext) : Instantiat
     override fun hasFallibleBuilder(shape: StructureShape): Boolean =
         BuilderGenerator.hasFallibleBuilder(shape, codegenContext.symbolProvider)
 
-    override fun setterName(memberShape: MemberShape): String = memberShape.setterName()
+    override fun setterName(memberShape: MemberShape): String = memberShape.setterName(codegenContext.symbolProvider)
 
     override fun doesSetterTakeInOption(memberShape: MemberShape): Boolean = true
 }
diff --git a/codegen-client/src/main/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/client/FluentBuilderGenerator.kt b/codegen-client/src/main/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/client/FluentBuilderGenerator.kt
index fb0bd64cc1b..42de896b058 100644
--- a/codegen-client/src/main/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/client/FluentBuilderGenerator.kt
+++ b/codegen-client/src/main/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/client/FluentBuilderGenerator.kt
@@ -367,11 +367,11 @@ class FluentBuilderGenerator(
                     else -> renderInputHelper(member, memberName, coreType)
                 }
                 // pure setter
-                val setterName = member.setterName()
+                val setterName = member.setterName(symbolProvider)
                 val optionalInputType = outerType.asOptional()
                 renderInputHelper(member, setterName, optionalInputType)
 
-                val getterName = member.getterName()
+                val getterName = member.getterName(symbolProvider)
                 renderGetterHelper(member, getterName, optionalInputType)
             }
         }
@@ -437,7 +437,7 @@ class FluentBuilderGenerator(
             """
             Appends an item to `${member.memberName}`.
 
-            To override the contents of this collection use [`${member.setterName()}`](Self::${member.setterName()}).
+            To override the contents of this collection use [`${member.setterName(symbolProvider)}`](Self::${member.setterName(symbolProvider)}).
             """,
         )
         documentShape(member, model)
@@ -467,7 +467,7 @@ class FluentBuilderGenerator(
             """
             Adds a key-value pair to `${member.memberName}`.
 
-            To override the contents of this collection use [`${member.setterName()}`](Self::${member.setterName()}).
+            To override the contents of this collection use [`${member.setterName(symbolProvider)}`](Self::${member.setterName(symbolProvider)}).
             """,
         )
         documentShape(member, model)
diff --git a/codegen-client/src/main/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/client/FluentClientGenerator.kt b/codegen-client/src/main/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/client/FluentClientGenerator.kt
index 3d28f4818d2..d00a1062f3c 100644
--- a/codegen-client/src/main/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/client/FluentClientGenerator.kt
+++ b/codegen-client/src/main/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/client/FluentClientGenerator.kt
@@ -359,7 +359,7 @@ private fun generateOperationShapeDocs(
         val builderInputDoc = memberShape.asFluentBuilderInputDoc(symbolProvider)
         val builderInputLink = docLink("$fluentBuilderFullyQualifiedName::${symbolProvider.toMemberName(memberShape)}")
         val builderSetterDoc = memberShape.asFluentBuilderSetterDoc(symbolProvider)
-        val builderSetterLink = docLink("$fluentBuilderFullyQualifiedName::${memberShape.setterName()}")
+        val builderSetterLink = docLink("$fluentBuilderFullyQualifiedName::${memberShape.setterName(symbolProvider)}")
 
         val docTrait = memberShape.getMemberTrait(model, DocumentationTrait::class.java).orNull()
         val docs =
@@ -440,7 +440,7 @@ internal fun MemberShape.asFluentBuilderInputDoc(symbolProvider: SymbolProvider)
  *  _NOTE: This function generates the setter type names that appear under **"The fluent builder is configurable:"**_
  */
 private fun MemberShape.asFluentBuilderSetterDoc(symbolProvider: SymbolProvider): String {
-    val memberName = this.setterName()
+    val memberName = this.setterName(symbolProvider)
     val outerType = symbolProvider.toSymbol(this).rustType()
 
     return "$memberName(${outerType.asArgumentType(fullyQualified = false)})"
diff --git a/codegen-client/src/main/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/protocol/ProtocolParserGenerator.kt b/codegen-client/src/main/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/protocol/ProtocolParserGenerator.kt
index 6bcc00d84a5..34e7a39a943 100644
--- a/codegen-client/src/main/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/protocol/ProtocolParserGenerator.kt
+++ b/codegen-client/src/main/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/protocol/ProtocolParserGenerator.kt
@@ -264,7 +264,7 @@ class ProtocolParserGenerator(
             val member = binding.member
             val parsedValue = renderBindingParser(binding, operationShape, httpBindingGenerator, structuredDataParser)
             if (parsedValue != null) {
-                withBlock("output = output.${member.setterName()}(", ");") {
+                withBlock("output = output.${member.setterName(symbolProvider)}(", ");") {
                     parsedValue(this)
                 }
             }
diff --git a/codegen-client/src/test/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/client/FluentClientGeneratorTest.kt b/codegen-client/src/test/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/client/FluentClientGeneratorTest.kt
index 1b958727af1..bddbb9c7c58 100644
--- a/codegen-client/src/test/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/client/FluentClientGeneratorTest.kt
+++ b/codegen-client/src/test/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/client/FluentClientGeneratorTest.kt
@@ -138,4 +138,60 @@ class FluentClientGeneratorTest {
 
         clientIntegrationTest(model)
     }
+
+    @Test
+    fun `meta field gets renamed to meta_value with correct setter`() {
+        val model =
+            """
+            namespace com.example
+            use aws.protocols#awsJson1_0
+
+            @awsJson1_0
+            service TestService {
+                operations: [TestOperation],
+                version: "1"
+            }
+
+            operation TestOperation { input: TestInput }
+            structure TestInput {
+               meta: String,
+               other: String
+            }
+            """.asSmithyModel()
+
+        clientIntegrationTest(model) { codegenContext, rustCrate ->
+            rustCrate.integrationTest("meta_field_renamed") {
+                val moduleName = codegenContext.moduleUseName()
+                rustTemplate(
+                    """
+                    ##[test]
+                    fn test_meta_field_accessors() {
+                        let config = $moduleName::Config::builder()
+                            .endpoint_url("http://localhost:1234")
+                            .http_client(#{NeverClient}::new())
+                            .build();
+                        let client = $moduleName::Client::from_conf(config);
+
+                        // Test the renamed field and setter
+                        let builder = client.test_operation()
+                            .meta_value("test_meta")
+                            .set_meta_value(Some("test_meta_2".to_string()))
+                            .other("other_value");
+
+                        // Verify getter returns correct value
+                        assert_eq!(*builder.get_meta_value(), Some("test_meta_2".to_string()));
+                        assert_eq!(*builder.get_other(), Some("other_value".to_string()));
+
+                        // Build the input and verify field is accessible
+                        let input = builder.as_input();
+                        assert_eq!(*input.get_meta_value(), Some("test_meta_2".to_string()));
+                    }
+                    """,
+                    "NeverClient" to
+                        CargoDependency.smithyHttpClientTestUtil(codegenContext.runtimeConfig).toType()
+                            .resolve("test_util::NeverClient"),
+                )
+            }
+        }
+    }
 }
diff --git a/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/generators/BuilderGenerator.kt b/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/generators/BuilderGenerator.kt
index 69aa40405d4..27da2f18360 100644
--- a/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/generators/BuilderGenerator.kt
+++ b/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/generators/BuilderGenerator.kt
@@ -134,11 +134,15 @@ class OperationBuildError(private val runtimeConfig: RuntimeConfig) {
     }
 }
 
-// Setter names will never hit a reserved word and therefore never need escaping.
-fun MemberShape.setterName() = "set_${this.memberName.toSnakeCase()}"
+fun MemberShape.setterName(symbolProvider: SymbolProvider): String {
+    val unescaped = symbolProvider.toMemberName(this).removePrefix("r##")
+    return "set_$unescaped"
+}
 
-// Getter names will never hit a reserved word and therefore never need escaping.
-fun MemberShape.getterName() = "get_${this.memberName.toSnakeCase()}"
+fun MemberShape.getterName(symbolProvider: SymbolProvider): String {
+    val unescaped = symbolProvider.toMemberName(this).removePrefix("r##")
+    return "get_$unescaped"
+}
 
 class BuilderGenerator(
     private val model: Model,
@@ -192,7 +196,7 @@ class BuilderGenerator(
                         val memberName = member.memberName.toSnakeCase()
                         val setter =
                             if (symbolProvider.toSymbol(member).isOptional()) {
-                                member.setterName()
+                                member.setterName(symbolProvider)
                             } else {
                                 memberName
                             }
@@ -311,7 +315,7 @@ class BuilderGenerator(
 
         writer.documentShape(member, model)
         writer.deprecatedShape(member)
-        writer.rustBlock("pub fn ${member.setterName()}(mut self, input: ${inputType.render(true)}) -> Self") {
+        writer.rustBlock("pub fn ${member.setterName(symbolProvider)}(mut self, input: ${inputType.render(true)}) -> Self") {
             rust("self.$memberName = input; self")
         }
     }
@@ -333,7 +337,7 @@ class BuilderGenerator(
 
         writer.documentShape(member, model)
         writer.deprecatedShape(member)
-        writer.rustBlock("pub fn ${member.getterName()}(&self) -> &${inputType.render(true)}") {
+        writer.rustBlock("pub fn ${member.getterName(symbolProvider)}(&self) -> &${inputType.render(true)}") {
             rust("&self.$memberName")
         }
     }
@@ -409,7 +413,13 @@ class BuilderGenerator(
     ) {
         docs("Appends an item to `$memberName`.")
         rust("///")
-        docs("To override the contents of this collection use [`${member.setterName()}`](Self::${member.setterName()}).")
+        docs(
+            "To override the contents of this collection use [`${member.setterName(symbolProvider)}`](Self::${
+                member.setterName(
+                    symbolProvider,
+                )
+            }).",
+        )
         rust("///")
         documentShape(member, model, autoSuppressMissingDocs = false)
         deprecatedShape(member)
@@ -435,7 +445,13 @@ class BuilderGenerator(
     ) {
         docs("Adds a key-value pair to `$memberName`.")
         rust("///")
-        docs("To override the contents of this collection use [`${member.setterName()}`](Self::${member.setterName()}).")
+        docs(
+            "To override the contents of this collection use [`${member.setterName(symbolProvider)}`](Self::${
+                member.setterName(
+                    symbolProvider,
+                )
+            }).",
+        )
         rust("///")
         documentShape(member, model, autoSuppressMissingDocs = false)
         deprecatedShape(member)
diff --git a/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/generators/BuilderInstantiator.kt b/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/generators/BuilderInstantiator.kt
index f73e8d5a055..1e9264d47ed 100644
--- a/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/generators/BuilderInstantiator.kt
+++ b/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/generators/BuilderInstantiator.kt
@@ -33,12 +33,14 @@ interface BuilderInstantiator {
         mapErr: Writable? = null,
     ): Writable
 
+    fun setterProvider(field: MemberShape): String
+
     /** Set a field on a builder using the `$setterName` method. $value will be passed directly. */
     fun setFieldWithSetter(
         builder: String,
         value: Writable,
         field: MemberShape,
     ) = writable {
-        rustTemplate("$builder = $builder.${field.setterName()}(#{value})", "value" to value)
+        rustTemplate("$builder = $builder.${setterProvider(field)}(#{value})", "value" to value)
     }
 }
diff --git a/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/parse/CborParserGenerator.kt b/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/parse/CborParserGenerator.kt
index 58dbb9c77fa..63d9dcde4fc 100644
--- a/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/parse/CborParserGenerator.kt
+++ b/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/parse/CborParserGenerator.kt
@@ -268,7 +268,7 @@ class CborParserGenerator(
                     rustBlock("${member.memberName.dq()} =>") {
                         val callBuilderSetMemberFieldWritable =
                             writable {
-                                withBlock("builder.${member.setterName()}(", ")") {
+                                withBlock("builder.${member.setterName(symbolProvider)}(", ")") {
                                     conditionalBlock("Some(", ")", shouldWrapBuilderMemberSetterInputWithOption(member)) {
                                         val symbol = symbolProvider.toSymbol(member)
                                         if (symbol.isRustBoxed()) {
diff --git a/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/parse/EventStreamUnmarshallerGenerator.kt b/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/parse/EventStreamUnmarshallerGenerator.kt
index 28737bf353c..23f5cde7f5c 100644
--- a/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/parse/EventStreamUnmarshallerGenerator.kt
+++ b/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/parse/EventStreamUnmarshallerGenerator.kt
@@ -253,7 +253,7 @@ class EventStreamUnmarshallerGenerator(
     }
 
     private fun RustWriter.renderUnmarshallEventHeader(member: MemberShape) {
-        withBlock("builder = builder.${member.setterName()}(", ");") {
+        withBlock("builder = builder.${member.setterName(symbolProvider)}(", ");") {
             conditionalBlock("Some(", ")", member.isOptional) {
                 when (val target = model.expectShape(member.target)) {
                     is BooleanShape -> rustTemplate("#{expect_fns}::expect_bool(header)?", *codegenScope)
@@ -287,7 +287,7 @@ class EventStreamUnmarshallerGenerator(
                 *codegenScope,
             )
         }
-        withBlock("builder = builder.${member.setterName()}(", ");") {
+        withBlock("builder = builder.${member.setterName(symbolProvider)}(", ");") {
             conditionalBlock("Some(", ")", member.isOptional) {
                 when (target) {
                     is BlobShape -> {
diff --git a/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/parse/JsonParserGenerator.kt b/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/parse/JsonParserGenerator.kt
index a1d4d360821..bc9caf989a4 100644
--- a/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/parse/JsonParserGenerator.kt
+++ b/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/parse/JsonParserGenerator.kt
@@ -262,14 +262,14 @@ class JsonParserGenerator(
                     rustBlock("${jsonName(member).dq()} =>") {
                         when (codegenTarget) {
                             CodegenTarget.CLIENT -> {
-                                withBlock("builder = builder.${member.setterName()}(", ");") {
+                                withBlock("builder = builder.${member.setterName(symbolProvider)}(", ");") {
                                     deserializeMember(member)
                                 }
                             }
 
                             CodegenTarget.SERVER -> {
                                 if (symbolProvider.toSymbol(member).isOptional()) {
-                                    withBlock("builder = builder.${member.setterName()}(", ");") {
+                                    withBlock("builder = builder.${member.setterName(symbolProvider)}(", ");") {
                                         deserializeMember(member)
                                     }
                                 } else {
@@ -278,7 +278,7 @@ class JsonParserGenerator(
                                     rust(
                                         """
                                         {
-                                            builder = builder.${member.setterName()}(v);
+                                            builder = builder.${member.setterName(symbolProvider)}(v);
                                         }
                                         """,
                                     )
diff --git a/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/parse/XmlBindingTraitParserGenerator.kt b/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/parse/XmlBindingTraitParserGenerator.kt
index 64cf8d9d7d2..4cbf6015c6a 100644
--- a/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/parse/XmlBindingTraitParserGenerator.kt
+++ b/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/parse/XmlBindingTraitParserGenerator.kt
@@ -294,7 +294,7 @@ class XmlBindingTraitParserGenerator(
                         Ctx(tag = decoder, accum = "$builder.${symbolProvider.toMemberName(member)}.take()"),
                     )
                 }
-                rust("$builder = $builder.${member.setterName()}($temp);")
+                rust("$builder = $builder.${member.setterName(symbolProvider)}($temp);")
             }
             rustTemplate(
                 "_ => return Err(#{XmlDecodeError}::custom(\"expected ${member.xmlName()} tag\"))",
@@ -333,7 +333,7 @@ class XmlBindingTraitParserGenerator(
                             forceOptional = true,
                         )
                     }
-                    rust("$builder = $builder.${member.setterName()}($temp);")
+                    rust("$builder = $builder.${member.setterName(symbolProvider)}($temp);")
                 }
             }
         }
diff --git a/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/testutil/DefaultBuilderInstantiator.kt b/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/testutil/DefaultBuilderInstantiator.kt
index aa11d70edb7..5fb9c607a9c 100644
--- a/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/testutil/DefaultBuilderInstantiator.kt
+++ b/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/testutil/DefaultBuilderInstantiator.kt
@@ -13,6 +13,7 @@ import software.amazon.smithy.rust.codegen.core.rustlang.writable
 import software.amazon.smithy.rust.codegen.core.smithy.RustSymbolProvider
 import software.amazon.smithy.rust.codegen.core.smithy.generators.BuilderGenerator
 import software.amazon.smithy.rust.codegen.core.smithy.generators.BuilderInstantiator
+import software.amazon.smithy.rust.codegen.core.smithy.generators.setterName
 
 /**
  * A Default instantiator that uses `builder.build()` in all cases. This exists to support tests in codegen-core
@@ -27,6 +28,10 @@ class DefaultBuilderInstantiator(private val checkFallibleBuilder: Boolean, priv
         return setFieldWithSetter(builder, value, field)
     }
 
+    override fun setterProvider(field: MemberShape): String {
+        return field.setterName(symbolProvider)
+    }
+
     override fun finalizeBuilder(
         builder: String,
         shape: StructureShape,
diff --git a/codegen-core/src/test/kotlin/software/amazon/smithy/rust/codegen/core/smithy/generators/InstantiatorTest.kt b/codegen-core/src/test/kotlin/software/amazon/smithy/rust/codegen/core/smithy/generators/InstantiatorTest.kt
index 346eaf103c7..0ee6f1165a7 100644
--- a/codegen-core/src/test/kotlin/software/amazon/smithy/rust/codegen/core/smithy/generators/InstantiatorTest.kt
+++ b/codegen-core/src/test/kotlin/software/amazon/smithy/rust/codegen/core/smithy/generators/InstantiatorTest.kt
@@ -100,7 +100,7 @@ class InstantiatorTest {
         override fun hasFallibleBuilder(shape: StructureShape) =
             BuilderGenerator.hasFallibleBuilder(shape, codegenContext.symbolProvider)
 
-        override fun setterName(memberShape: MemberShape) = memberShape.setterName()
+        override fun setterName(memberShape: MemberShape) = memberShape.setterName(codegenContext.symbolProvider)
 
         override fun doesSetterTakeInOption(memberShape: MemberShape) = true
     }
diff --git a/codegen-server/src/main/kotlin/software/amazon/smithy/rust/codegen/server/smithy/generators/ServerBuilderGenerator.kt b/codegen-server/src/main/kotlin/software/amazon/smithy/rust/codegen/server/smithy/generators/ServerBuilderGenerator.kt
index cea95c0265f..49af4a88073 100644
--- a/codegen-server/src/main/kotlin/software/amazon/smithy/rust/codegen/server/smithy/generators/ServerBuilderGenerator.kt
+++ b/codegen-server/src/main/kotlin/software/amazon/smithy/rust/codegen/server/smithy/generators/ServerBuilderGenerator.kt
@@ -32,6 +32,7 @@ import software.amazon.smithy.rust.codegen.core.smithy.RuntimeType
 import software.amazon.smithy.rust.codegen.core.smithy.RustCrate
 import software.amazon.smithy.rust.codegen.core.smithy.expectRustMetadata
 import software.amazon.smithy.rust.codegen.core.smithy.generators.lifetimeDeclaration
+import software.amazon.smithy.rust.codegen.core.smithy.generators.setterName
 import software.amazon.smithy.rust.codegen.core.smithy.isOptional
 import software.amazon.smithy.rust.codegen.core.smithy.isRustBoxed
 import software.amazon.smithy.rust.codegen.core.smithy.makeMaybeConstrained
@@ -45,7 +46,6 @@ import software.amazon.smithy.rust.codegen.core.util.dq
 import software.amazon.smithy.rust.codegen.core.util.hasTrait
 import software.amazon.smithy.rust.codegen.core.util.letIf
 import software.amazon.smithy.rust.codegen.core.util.redactIfNecessary
-import software.amazon.smithy.rust.codegen.core.util.toSnakeCase
 import software.amazon.smithy.rust.codegen.server.smithy.ServerCodegenContext
 import software.amazon.smithy.rust.codegen.server.smithy.canReachConstrainedShape
 import software.amazon.smithy.rust.codegen.server.smithy.generators.protocol.ServerProtocol
@@ -151,7 +151,12 @@ class ServerBuilderGenerator(
     private val builderSymbol = shape.serverBuilderSymbol(codegenContext)
     private val isBuilderFallible = hasFallibleBuilder(shape, model, symbolProvider, takeInUnconstrainedTypes)
     private val serverBuilderConstraintViolations =
-        ServerBuilderConstraintViolations(codegenContext, shape, takeInUnconstrainedTypes, customValidationExceptionWithReasonConversionGenerator)
+        ServerBuilderConstraintViolations(
+            codegenContext,
+            shape,
+            takeInUnconstrainedTypes,
+            customValidationExceptionWithReasonConversionGenerator,
+        )
     private val lifetime = shape.lifetimeDeclaration(symbolProvider)
 
     private val codegenScope =
@@ -236,7 +241,9 @@ class ServerBuilderGenerator(
             #{Converter:W}
             """,
             "Converter" to
-                customValidationExceptionWithReasonConversionGenerator.renderImplFromConstraintViolationForRequestRejection(protocol),
+                customValidationExceptionWithReasonConversionGenerator.renderImplFromConstraintViolationForRequestRejection(
+                    protocol,
+                ),
         )
     }
 
@@ -326,7 +333,8 @@ class ServerBuilderGenerator(
         val memberName = symbolProvider.toMemberName(member)
 
         val hasBox = symbol.mapRustType { it.stripOuter<RustType.Option>() }.isRustBoxed()
-        val wrapInMaybeConstrained = takeInUnconstrainedTypes && member.targetCanReachConstrainedShape(model, symbolProvider)
+        val wrapInMaybeConstrained =
+            takeInUnconstrainedTypes && member.targetCanReachConstrainedShape(model, symbolProvider)
 
         writer.documentShape(member, model)
         writer.deprecatedShape(member)
@@ -351,7 +359,11 @@ class ServerBuilderGenerator(
                     if (!constrainedTypeHoldsFinalType(member)) varExpr = "($varExpr).into()"
 
                     if (wrapInMaybeConstrained) {
-                        conditionalBlock("input.map(##[allow(clippy::redundant_closure)] |v| ", ")", conditional = symbol.isOptional()) {
+                        conditionalBlock(
+                            "input.map(##[allow(clippy::redundant_closure)] |v| ",
+                            ")",
+                            conditional = symbol.isOptional(),
+                        ) {
                             conditionalBlock("Box::new(", ")", conditional = hasBox) {
                                 rust("$maybeConstrainedVariant($varExpr)")
                             }
@@ -408,8 +420,7 @@ class ServerBuilderGenerator(
         val memberName = symbolProvider.toMemberName(member)
 
         writer.documentShape(member, model)
-        // Setter names will never hit a reserved word and therefore never need escaping.
-        writer.rustBlock("pub(crate) fn set_${member.memberName.toSnakeCase()}(mut self, input: $inputType) -> Self") {
+        writer.rustBlock("pub(crate) fn ${member.setterName(symbolProvider)}(mut self, input: $inputType) -> Self") {
             rust(
                 """
                 self.$memberName = ${
@@ -531,9 +542,10 @@ class ServerBuilderGenerator(
                     // Write the modifier(s).
 
                     // 1. Enforce constraint traits of data from incoming requests.
-                    serverBuilderConstraintViolations.builderConstraintViolationForMember(member)?.also { constraintViolation ->
-                        enforceConstraints(this, member, constraintViolation)
-                    }
+                    serverBuilderConstraintViolations.builderConstraintViolationForMember(member)
+                        ?.also { constraintViolation ->
+                            enforceConstraints(this, member, constraintViolation)
+                        }
 
                     if (member.hasNonNullDefault()) {
                         // 2a. If a `@default` value is modeled and the user did not set a value, fall back to using the
@@ -610,7 +622,11 @@ class ServerBuilderGenerator(
         // We've just checked the constraints hold by going through the non-public
         // constrained type, but the user wants to work with the unconstrained type, so we have to
         // unwrap it.
-        if (!publicConstrainedTypes && member.wouldHaveConstrainedWrapperTupleTypeWerePublicConstrainedTypesEnabled(model)) {
+        if (!publicConstrainedTypes &&
+            member.wouldHaveConstrainedWrapperTupleTypeWerePublicConstrainedTypesEnabled(
+                model,
+            )
+        ) {
             writer.rust(
                 ".map(|v: #T| v.into())",
                 constrainedShapeSymbolProvider.toSymbol(model.expectShape(member.target)),
diff --git a/codegen-server/src/main/kotlin/software/amazon/smithy/rust/codegen/server/smithy/generators/ServerInstantiator.kt b/codegen-server/src/main/kotlin/software/amazon/smithy/rust/codegen/server/smithy/generators/ServerInstantiator.kt
index 5b4860c26db..19fcd638fde 100644
--- a/codegen-server/src/main/kotlin/software/amazon/smithy/rust/codegen/server/smithy/generators/ServerInstantiator.kt
+++ b/codegen-server/src/main/kotlin/software/amazon/smithy/rust/codegen/server/smithy/generators/ServerInstantiator.kt
@@ -18,6 +18,7 @@ import software.amazon.smithy.rust.codegen.core.smithy.generators.BuilderInstant
 import software.amazon.smithy.rust.codegen.core.smithy.generators.Instantiator
 import software.amazon.smithy.rust.codegen.core.smithy.generators.InstantiatorCustomization
 import software.amazon.smithy.rust.codegen.core.smithy.generators.InstantiatorSection
+import software.amazon.smithy.rust.codegen.core.smithy.generators.setterName
 import software.amazon.smithy.rust.codegen.core.smithy.isOptional
 import software.amazon.smithy.rust.codegen.core.smithy.protocols.parse.ReturnSymbolToParse
 import software.amazon.smithy.rust.codegen.server.smithy.ServerCodegenContext
@@ -118,6 +119,10 @@ class ServerBuilderInstantiator(
         }
     }
 
+    override fun setterProvider(field: MemberShape): String {
+        return field.setterName(symbolProvider)
+    }
+
     override fun finalizeBuilder(
         builder: String,
         shape: StructureShape,
diff --git a/codegen-server/src/main/kotlin/software/amazon/smithy/rust/codegen/server/smithy/protocols/ServerHttpBoundProtocolGenerator.kt b/codegen-server/src/main/kotlin/software/amazon/smithy/rust/codegen/server/smithy/protocols/ServerHttpBoundProtocolGenerator.kt
index ff2c5278754..3950c1b2595 100644
--- a/codegen-server/src/main/kotlin/software/amazon/smithy/rust/codegen/server/smithy/protocols/ServerHttpBoundProtocolGenerator.kt
+++ b/codegen-server/src/main/kotlin/software/amazon/smithy/rust/codegen/server/smithy/protocols/ServerHttpBoundProtocolGenerator.kt
@@ -823,7 +823,7 @@ class ServerHttpBoundProtocolTraitImplGenerator(
                 rustTemplate(
                     """
                     if let Some(value) = #{ParsedValue:W} {
-                        input = input.${member.setterName()}($valueToSet)
+                        input = input.${member.setterName(symbolProvider)}($valueToSet)
                     }
                     """,
                     "ParsedValue" to parsedValue,
@@ -1099,7 +1099,7 @@ class ServerHttpBoundProtocolTraitImplGenerator(
                     val deserializer = generateParseStrFn(binding, true)
                     rustTemplate(
                         """
-                        input = input.${binding.member.setterName()}(
+                        input = input.${binding.member.setterName(symbolProvider)}(
                             #{deserializer}(m$index)?
                         );
                         """,
@@ -1200,7 +1200,7 @@ class ServerHttpBoundProtocolTraitImplGenerator(
                     rustTemplate(
                         """
                         if !${memberName}_seen && k == "${it.locationName}" {
-                            input = input.${it.member.setterName()}(
+                            input = input.${it.member.setterName(symbolProvider)}(
                                 #{deserializer}(&v)?
                             );
                             ${memberName}_seen = true;
@@ -1314,7 +1314,7 @@ class ServerHttpBoundProtocolTraitImplGenerator(
                     unconstrainedShapeSymbolProvider
                         .toSymbol(queryParamsBinding.member)
                         .isOptional()
-                withBlock("input = input.${queryParamsBinding.member.setterName()}(", ");") {
+                withBlock("input = input.${queryParamsBinding.member.setterName(symbolProvider)}(", ");") {
                     conditionalBlock("Some(", ")", conditional = isOptional) {
                         write("query_params")
                     }
@@ -1332,7 +1332,7 @@ class ServerHttpBoundProtocolTraitImplGenerator(
                 rustBlock("if !$memberName.is_empty()") {
                     withBlock(
                         "input = input.${
-                            binding.member.setterName()
+                            binding.member.setterName(symbolProvider)
                         }(",
                         ");",
                     ) {