diff --git a/common/typeinfo.h b/common/typeinfo.h
index de242ad49..dadc42cba 100644
--- a/common/typeinfo.h
+++ b/common/typeinfo.h
@@ -81,7 +81,7 @@ std::enable_if_t<
     std::conjunction_v<common_internal::HasNativeTypeTraitsId<T>,
                        std::negation<common_internal::HasCelTypeId<T>>>,
     TypeInfo>
-TypeId(const T& t) {
+TypeId(const T& t [[maybe_unused]]) {
   return NativeTypeTraits<absl::remove_cvref_t<T>>::Id(t);
 }
 
@@ -91,7 +91,7 @@ std::enable_if_t<
                        std::negation<common_internal::HasCelTypeId<T>>,
                        std::is_final<T>>,
     TypeInfo>
-TypeId(const T& t) {
+TypeId(const T& t [[maybe_unused]]) {
   return cel::TypeId<absl::remove_cvref_t<T>>();
 }
 
@@ -100,7 +100,7 @@ std::enable_if_t<
     std::conjunction_v<std::negation<common_internal::HasNativeTypeTraitsId<T>>,
                        common_internal::HasCelTypeId<T>>,
     TypeInfo>
-TypeId(const T& t) {
+TypeId(const T& t [[maybe_unused]]) {
   return CelTypeId(t);
 }
 
diff --git a/common/values/list_value.h b/common/values/list_value.h
index 73aadf789..516d16dcc 100644
--- a/common/values/list_value.h
+++ b/common/values/list_value.h
@@ -272,7 +272,7 @@ class ListValueBuilder {
 
   virtual size_t Size() const = 0;
 
-  virtual void Reserve(size_t capacity) {}
+  virtual void Reserve(size_t capacity [[maybe_unused]]) {}
 
   virtual ListValue Build() && = 0;
 };
diff --git a/common/values/map_value.h b/common/values/map_value.h
index 093100f96..ffbdea6c9 100644
--- a/common/values/map_value.h
+++ b/common/values/map_value.h
@@ -294,7 +294,7 @@ class MapValueBuilder {
 
   virtual size_t Size() const = 0;
 
-  virtual void Reserve(size_t capacity) {}
+  virtual void Reserve(size_t capacity [[maybe_unused]]) {}
 
   virtual MapValue Build() && = 0;
 };
diff --git a/eval/public/structs/legacy_type_adapter.h b/eval/public/structs/legacy_type_adapter.h
index 795c56339..1c239bdb9 100644
--- a/eval/public/structs/legacy_type_adapter.h
+++ b/eval/public/structs/legacy_type_adapter.h
@@ -65,9 +65,9 @@ class LegacyTypeMutationApis {
       CelValue::MessageWrapper::Builder& instance) const = 0;
 
   virtual absl::Status SetFieldByNumber(
-      int64_t field_number, const CelValue& value,
-      cel::MemoryManagerRef memory_manager,
-      CelValue::MessageWrapper::Builder& instance) const {
+      int64_t field_number [[maybe_unused]], const CelValue& value [[maybe_unused]],
+      cel::MemoryManagerRef memory_manager [[maybe_unused]],
+      CelValue::MessageWrapper::Builder& instance [[maybe_unused]]) const {
     return absl::UnimplementedError("SetFieldByNumber is not yet implemented");
   }
 };
@@ -116,8 +116,8 @@ class LegacyTypeAccessApis {
   //   whether the leaf field is set to a non-default value.
   virtual absl::StatusOr<LegacyQualifyResult> Qualify(
       absl::Span<const cel::SelectQualifier>,
-      const CelValue::MessageWrapper& instance, bool presence_test,
-      cel::MemoryManagerRef memory_manager) const {
+      const CelValue::MessageWrapper& instance [[maybe_unused]], bool presence_test [[maybe_unused]],
+      cel::MemoryManagerRef memory_manager [[maybe_unused]]) const {
     return absl::UnimplementedError("Qualify unsupported.");
   }
 
diff --git a/eval/public/structs/legacy_type_info_apis.h b/eval/public/structs/legacy_type_info_apis.h
index 7226b3b48..4f07470a1 100644
--- a/eval/public/structs/legacy_type_info_apis.h
+++ b/eval/public/structs/legacy_type_info_apis.h
@@ -62,7 +62,7 @@ class LegacyTypeInfoApis {
       const MessageWrapper& wrapped_message) const = 0;
 
   virtual const google::protobuf::Descriptor* absl_nullable GetDescriptor(
-      const MessageWrapper& wrapped_message) const {
+      const MessageWrapper& wrapped_message [[maybe_unused]]) const {
     return nullptr;
   }
 
@@ -84,7 +84,7 @@ class LegacyTypeInfoApis {
   //
   // Nullptr signals that the value does not provide mutation apis.
   virtual const LegacyTypeMutationApis* GetMutationApis(
-      const MessageWrapper& wrapped_message) const {
+      const MessageWrapper& wrapped_message [[maybe_unused]]) const {
     return nullptr;
   }
 
@@ -93,7 +93,7 @@ class LegacyTypeInfoApis {
   // The underlying string is expected to remain valid as long as the
   // LegacyTypeInfoApis instance.
   virtual absl::optional<FieldDescription> FindFieldByName(
-      absl::string_view name) const {
+      absl::string_view name [[maybe_unused]]) const {
     return absl::nullopt;
   }
 };
diff --git a/eval/public/structs/proto_message_type_adapter.h b/eval/public/structs/proto_message_type_adapter.h
index e7b4a4c7f..f2fc43a8a 100644
--- a/eval/public/structs/proto_message_type_adapter.h
+++ b/eval/public/structs/proto_message_type_adapter.h
@@ -52,7 +52,7 @@ class ProtoMessageTypeAdapter : public LegacyTypeInfoApis,
       const MessageWrapper& wrapped_message) const override;
 
   const google::protobuf::Descriptor* absl_nullable GetDescriptor(
-      const MessageWrapper& wrapped_message) const override {
+      const MessageWrapper& wrapped_message [[maybe_unused]]) const override {
     return descriptor_;
   }
 
diff --git a/runtime/internal/attribute_matcher.h b/runtime/internal/attribute_matcher.h
index 271749bf6..5235f1036 100644
--- a/runtime/internal/attribute_matcher.h
+++ b/runtime/internal/attribute_matcher.h
@@ -29,14 +29,14 @@ class AttributeMatcher {
 
   // Checks whether the attribute trail matches any unknown patterns.
   // Used to identify and collect referenced unknowns in an UnknownValue.
-  virtual MatchResult CheckForUnknown(const Attribute& attr) const {
+  virtual MatchResult CheckForUnknown(const Attribute& attr [[maybe_unused]]) const {
     return MatchResult::NONE;
   };
 
   // Checks whether the attribute trail matches any missing patterns.
   // Used to identify missing attributes, and report an error if referenced
   // directly.
-  virtual MatchResult CheckForMissing(const Attribute& attr) const {
+  virtual MatchResult CheckForMissing(const Attribute& attr [[maybe_unused]]) const {
     return MatchResult::NONE;
   };
 };