--- a/cpp/src/arrow/array/builder_binary.h
+++ b/cpp/src/arrow/array/builder_binary.h
@@ -53,7 +53,7 @@ class BaseBinaryBuilder : public ArrayBuilder {
   explicit BaseBinaryBuilder(MemoryPool* pool = default_memory_pool())
       : ArrayBuilder(pool), offsets_builder_(pool), value_data_builder_(pool) {}
 
-  BaseBinaryBuilder(const std::shared_ptr<DataType>& type, MemoryPool* pool)
+  BaseBinaryBuilder(const std::shared_ptr<DataType>& /*type*/, MemoryPool* pool)
       : BaseBinaryBuilder(pool) {}
 
   Status Append(const uint8_t* value, offset_type length) {
--- a/cpp/src/arrow/array/builder_dict.h
+++ b/cpp/src/arrow/array/builder_dict.h
@@ -400,11 +400,11 @@ class DictionaryBuilderBase<BuilderType, NullType> : public ArrayBuilder {
   DictionaryBuilderBase(
       enable_if_t<std::is_base_of<AdaptiveIntBuilderBase, B>::value, uint8_t>
           start_int_size,
-      const std::shared_ptr<DataType>& value_type,
+      const std::shared_ptr<DataType>& /*value_type*/,
       MemoryPool* pool = default_memory_pool())
       : ArrayBuilder(pool), indices_builder_(start_int_size, pool) {}
 
-  explicit DictionaryBuilderBase(const std::shared_ptr<DataType>& value_type,
+  explicit DictionaryBuilderBase(const std::shared_ptr<DataType>& /*value_type*/,
                                  MemoryPool* pool = default_memory_pool())
       : ArrayBuilder(pool), indices_builder_(pool) {}
 
@@ -418,7 +418,7 @@ class DictionaryBuilderBase<BuilderType, NullType> : public ArrayBuilder {
   explicit DictionaryBuilderBase(MemoryPool* pool = default_memory_pool())
       : ArrayBuilder(pool), indices_builder_(pool) {}
 
-  explicit DictionaryBuilderBase(const std::shared_ptr<Array>& dictionary,
+  explicit DictionaryBuilderBase(const std::shared_ptr<Array>& /*dictionary*/,
                                  MemoryPool* pool = default_memory_pool())
       : ArrayBuilder(pool), indices_builder_(pool) {}
 
--- a/cpp/src/arrow/array/builder_primitive.h
+++ b/cpp/src/arrow/array/builder_primitive.h
@@ -31,7 +31,7 @@ namespace arrow {
 class ARROW_EXPORT NullBuilder : public ArrayBuilder {
  public:
   explicit NullBuilder(MemoryPool* pool = default_memory_pool()) : ArrayBuilder(pool) {}
-  explicit NullBuilder(const std::shared_ptr<DataType>& type,
+  explicit NullBuilder(const std::shared_ptr<DataType>& /*type*/,
                        MemoryPool* pool = default_memory_pool())
       : NullBuilder(pool) {}
 
--- a/cpp/src/arrow/util/mutex.h
+++ b/cpp/src/arrow/util/mutex.h
@@ -37,7 +37,7 @@ class ARROW_EXPORT Mutex {
   /// A Guard is falsy if a lock could not be acquired.
   class ARROW_EXPORT Guard {
    public:
-    Guard() : locked_(NULLPTR, [](Mutex* mutex) {}) {}
+    Guard() : locked_(NULLPTR, [](Mutex* /* mutex */) {}) {}
     Guard(Guard&&) = default;
     Guard& operator=(Guard&&) = default;
 
--- a/cpp/src/arrow/util/variant.h
+++ b/cpp/src/arrow/util/variant.h
@@ -144,11 +144,11 @@ struct VariantImpl<Variant<T...>> : VariantStorage<T...> {
   void copy_to(...) const {}
 
   template <typename R, typename Visitor>
-  [[noreturn]] R visit_const(Visitor&& visitor) const {
+  [[noreturn]] R visit_const(Visitor&& /* visitor */) const {
     std::terminate();
   }
   template <typename R, typename Visitor>
-  [[noreturn]] R visit_mutable(Visitor&& visitor) {
+  [[noreturn]] R visit_mutable(Visitor&& /* visitor */) {
     std::terminate();
   }
 };
--- a/cpp/src/arrow/util/value_parsing.h
+++ b/cpp/src/arrow/util/value_parsing.h
@@ -717,7 +717,7 @@ struct StringConverter<DATE_TYPE, enable_if_date<DATE_TYPE>> {
                                 arrow_vendored::date::days,
                                 std::chrono::milliseconds>::type;

-  static bool Convert(const DATE_TYPE& type, const char* s, size_t length,
+  static bool Convert(const DATE_TYPE& /* type */, const char* s, size_t length,
                       value_type* out) {
     if (length != 10) return false;