diff --git a/src/core/lib/surface/channel_ping.cc b/src/core/lib/surface/channel_ping.cc
index bae945942f2..be02a051df4 100644
--- a/src/core/lib/surface/channel_ping.cc
+++ b/src/core/lib/surface/channel_ping.cc
@@ -35,7 +35,7 @@ typedef struct {
   grpc_cq_completion completion_storage;
 } ping_result;
 
-static void ping_destroy(void* arg, grpc_cq_completion* storage) {
+static void ping_destroy(void* arg, grpc_cq_completion* /*storage*/) {
   gpr_free(arg);
 }
 
diff --git a/src/core/lib/surface/completion_queue.cc b/src/core/lib/surface/completion_queue.cc
index 646d2c5fa61..0f882851966 100644
--- a/src/core/lib/surface/completion_queue.cc
+++ b/src/core/lib/surface/completion_queue.cc
@@ -529,7 +529,8 @@ grpc_completion_queue* grpc_completion_queue_create_internal(
 }
 
 static void cq_init_next(
-    void* data, grpc_experimental_completion_queue_functor* shutdown_callback) {
+    void* data,
+    grpc_experimental_completion_queue_functor* /*shutdown_callback*/) {
   new (data) cq_next_data();
 }
 
@@ -539,7 +540,8 @@ static void cq_destroy_next(void* data) {
 }
 
 static void cq_init_pluck(
-    void* data, grpc_experimental_completion_queue_functor* shutdown_callback) {
+    void* data,
+    grpc_experimental_completion_queue_functor* /*shutdown_callback*/) {
   new (data) cq_pluck_data();
 }
 
@@ -582,7 +584,7 @@ void grpc_cq_internal_ref(grpc_completion_queue* cq) {
   cq->owning_refs.Ref(debug_location, reason);
 }
 
-static void on_pollset_shutdown_done(void* arg, grpc_error* error) {
+static void on_pollset_shutdown_done(void* arg, grpc_error* /*error*/) {
   grpc_completion_queue* cq = static_cast<grpc_completion_queue*>(arg);
   GRPC_CQ_INTERNAL_UNREF(cq, "pollset_destroy");
 }
@@ -630,20 +632,21 @@ static void cq_check_tag(grpc_completion_queue* cq, void* tag, bool lock_cq) {
   GPR_ASSERT(found);
 }
 #else
-static void cq_check_tag(grpc_completion_queue* cq, void* tag, bool lock_cq) {}
+static void cq_check_tag(grpc_completion_queue* /*cq*/, void* /*tag*/,
+                         bool /*lock_cq*/) {}
 #endif
 
-static bool cq_begin_op_for_next(grpc_completion_queue* cq, void* tag) {
+static bool cq_begin_op_for_next(grpc_completion_queue* cq, void* /*tag*/) {
   cq_next_data* cqd = static_cast<cq_next_data*> DATA_FROM_CQ(cq);
   return cqd->pending_events.IncrementIfNonzero();
 }
 
-static bool cq_begin_op_for_pluck(grpc_completion_queue* cq, void* tag) {
+static bool cq_begin_op_for_pluck(grpc_completion_queue* cq, void* /*tag*/) {
   cq_pluck_data* cqd = static_cast<cq_pluck_data*> DATA_FROM_CQ(cq);
   return cqd->pending_events.IncrementIfNonzero();
 }
 
-static bool cq_begin_op_for_callback(grpc_completion_queue* cq, void* tag) {
+static bool cq_begin_op_for_callback(grpc_completion_queue* cq, void* /*tag*/) {
   cq_callback_data* cqd = static_cast<cq_callback_data*> DATA_FROM_CQ(cq);
   return cqd->pending_events.IncrementIfNonzero();
 }
@@ -669,7 +672,7 @@ bool grpc_cq_begin_op(grpc_completion_queue* cq, void* tag) {
 static void cq_end_op_for_next(
     grpc_completion_queue* cq, void* tag, grpc_error* error,
     void (*done)(void* done_arg, grpc_cq_completion* storage), void* done_arg,
-    grpc_cq_completion* storage, bool internal) {
+    grpc_cq_completion* storage, bool /*internal*/) {
   GPR_TIMER_SCOPE("cq_end_op_for_next", 0);
 
   if (GRPC_TRACE_FLAG_ENABLED(grpc_api_trace) ||
@@ -748,7 +751,7 @@ static void cq_end_op_for_next(
 static void cq_end_op_for_pluck(
     grpc_completion_queue* cq, void* tag, grpc_error* error,
     void (*done)(void* done_arg, grpc_cq_completion* storage), void* done_arg,
-    grpc_cq_completion* storage, bool internal) {
+    grpc_cq_completion* storage, bool /*internal*/) {
   GPR_TIMER_SCOPE("cq_end_op_for_pluck", 0);
 
   cq_pluck_data* cqd = static_cast<cq_pluck_data*> DATA_FROM_CQ(cq);
@@ -936,7 +939,7 @@ static void dump_pending_tags(grpc_completion_queue* cq) {
   gpr_free(out);
 }
 #else
-static void dump_pending_tags(grpc_completion_queue* cq) {}
+static void dump_pending_tags(grpc_completion_queue* /*cq*/) {}
 #endif
 
 static grpc_event cq_next(grpc_completion_queue* cq, gpr_timespec deadline,
diff --git a/src/core/lib/surface/completion_queue_factory.cc b/src/core/lib/surface/completion_queue_factory.cc
index 2616c156e45..72aa03adfd4 100644
--- a/src/core/lib/surface/completion_queue_factory.cc
+++ b/src/core/lib/surface/completion_queue_factory.cc
@@ -28,7 +28,7 @@
  */
 
 static grpc_completion_queue* default_create(
-    const grpc_completion_queue_factory* factory,
+    const grpc_completion_queue_factory* /*factory*/,
     const grpc_completion_queue_attributes* attr) {
   return grpc_completion_queue_create_internal(
       attr->cq_completion_type, attr->cq_polling_type, attr->cq_shutdown_cb);
diff --git a/src/core/lib/surface/init.cc b/src/core/lib/surface/init.cc
index 2812427f7a0..d8bc4e4dd32 100644
--- a/src/core/lib/surface/init.cc
+++ b/src/core/lib/surface/init.cc
@@ -197,7 +197,7 @@ void grpc_shutdown_internal_locked(void) {
   grpc_destroy_static_metadata_ctx();
 }
 
-void grpc_shutdown_internal(void* ignored) {
+void grpc_shutdown_internal(void* /*ignored*/) {
   GRPC_API_TRACE("grpc_shutdown_internal", 0, ());
   grpc_core::MutexLock lock(&g_init_mu);
   // We have released lock from the shutdown thread and it is possible that
diff --git a/src/core/lib/surface/init_secure.cc b/src/core/lib/surface/init_secure.cc
index 233089437e9..f2c236dd79e 100644
--- a/src/core/lib/surface/init_secure.cc
+++ b/src/core/lib/surface/init_secure.cc
@@ -37,7 +37,7 @@
 void grpc_security_pre_init(void) {}
 
 static bool maybe_prepend_client_auth_filter(
-    grpc_channel_stack_builder* builder, void* arg) {
+    grpc_channel_stack_builder* builder, void* /*arg*/) {
   const grpc_channel_args* args =
       grpc_channel_stack_builder_get_channel_arguments(builder);
   if (args) {
@@ -52,7 +52,7 @@ static bool maybe_prepend_client_auth_filter(
 }
 
 static bool maybe_prepend_server_auth_filter(
-    grpc_channel_stack_builder* builder, void* arg) {
+    grpc_channel_stack_builder* builder, void* /*arg*/) {
   const grpc_channel_args* args =
       grpc_channel_stack_builder_get_channel_arguments(builder);
   if (args) {
diff --git a/src/core/lib/surface/lame_client.cc b/src/core/lib/surface/lame_client.cc
index 565f386ba74..e2a0cfd2dd3 100644
--- a/src/core/lib/surface/lame_client.cc
+++ b/src/core/lib/surface/lame_client.cc
@@ -94,8 +94,8 @@ static void lame_start_transport_stream_op_batch(
       calld->call_combiner);
 }
 
-static void lame_get_channel_info(grpc_channel_element* elem,
-                                  const grpc_channel_info* channel_info) {}
+static void lame_get_channel_info(grpc_channel_element* /*elem*/,
+                                  const grpc_channel_info* /*channel_info*/) {}
 
 static void lame_start_transport_op(grpc_channel_element* elem,
                                     grpc_transport_op* op) {
@@ -133,8 +133,8 @@ static grpc_error* lame_init_call_elem(grpc_call_element* elem,
   return GRPC_ERROR_NONE;
 }
 
-static void lame_destroy_call_elem(grpc_call_element* elem,
-                                   const grpc_call_final_info* final_info,
+static void lame_destroy_call_elem(grpc_call_element* /*elem*/,
+                                   const grpc_call_final_info* /*final_info*/,
                                    grpc_closure* then_schedule_closure) {
   GRPC_CLOSURE_SCHED(then_schedule_closure, GRPC_ERROR_NONE);
 }
diff --git a/src/core/lib/surface/server.cc b/src/core/lib/surface/server.cc
index 16186fa0377..eed32a9a23d 100644
--- a/src/core/lib/surface/server.cc
+++ b/src/core/lib/surface/server.cc
@@ -302,7 +302,7 @@ struct shutdown_cleanup_args {
   grpc_slice slice;
 };
 
-static void shutdown_cleanup(void* arg, grpc_error* error) {
+static void shutdown_cleanup(void* arg, grpc_error* /*error*/) {
   struct shutdown_cleanup_args* a =
       static_cast<struct shutdown_cleanup_args*>(arg);
   grpc_slice_unref_internal(a->slice);
@@ -367,7 +367,7 @@ static void request_matcher_destroy(request_matcher* rm) {
   gpr_free(rm->requests_per_cq);
 }
 
-static void kill_zombie(void* elem, grpc_error* error) {
+static void kill_zombie(void* elem, grpc_error* /*error*/) {
   grpc_call_unref(
       grpc_call_from_top_element(static_cast<grpc_call_element*>(elem)));
 }
@@ -449,7 +449,7 @@ static void orphan_channel(channel_data* chand) {
   chand->next = chand->prev = chand;
 }
 
-static void finish_destroy_channel(void* cd, grpc_error* error) {
+static void finish_destroy_channel(void* cd, grpc_error* /*error*/) {
   channel_data* chand = static_cast<channel_data*>(cd);
   grpc_server* server = chand->server;
   GRPC_CHANNEL_INTERNAL_UNREF(chand->channel, "server");
@@ -477,7 +477,7 @@ static void destroy_channel(channel_data* chand) {
                        op);
 }
 
-static void done_request_event(void* req, grpc_cq_completion* c) {
+static void done_request_event(void* req, grpc_cq_completion* /*c*/) {
   gpr_free(req);
 }
 
@@ -672,7 +672,8 @@ static int num_listeners(grpc_server* server) {
   return n;
 }
 
-static void done_shutdown_event(void* server, grpc_cq_completion* completion) {
+static void done_shutdown_event(void* server,
+                                grpc_cq_completion* /*completion*/) {
   server_unref(static_cast<grpc_server*>(server));
 }
 
@@ -850,7 +851,7 @@ static void got_initial_metadata(void* ptr, grpc_error* error) {
   }
 }
 
-static void accept_stream(void* cd, grpc_transport* transport,
+static void accept_stream(void* cd, grpc_transport* /*transport*/,
                           const void* transport_server_data) {
   channel_data* chand = static_cast<channel_data*>(cd);
   /* create a call */
@@ -895,8 +896,8 @@ static grpc_error* server_init_call_elem(grpc_call_element* elem,
 }
 
 static void server_destroy_call_elem(grpc_call_element* elem,
-                                     const grpc_call_final_info* final_info,
-                                     grpc_closure* ignored) {
+                                     const grpc_call_final_info* /*final_info*/,
+                                     grpc_closure* /*ignored*/) {
   call_data* calld = static_cast<call_data*>(elem->call_data);
   calld->~call_data();
   channel_data* chand = static_cast<channel_data*>(elem->channel_data);
@@ -1258,7 +1259,7 @@ void done_published_shutdown(void* done_arg, grpc_cq_completion* storage) {
   gpr_free(storage);
 }
 
-static void listener_destroy_done(void* s, grpc_error* error) {
+static void listener_destroy_done(void* s, grpc_error* /*error*/) {
   grpc_server* server = static_cast<grpc_server*>(s);
   gpr_mu_lock(&server->mu_global);
   server->listeners_destroyed++;
diff --git a/src/core/lib/transport/byte_stream.cc b/src/core/lib/transport/byte_stream.cc
index 1dd234c3761..82f34ca1504 100644
--- a/src/core/lib/transport/byte_stream.cc
+++ b/src/core/lib/transport/byte_stream.cc
@@ -53,8 +53,8 @@ void SliceBufferByteStream::Orphan() {
   // filter stack.
 }
 
-bool SliceBufferByteStream::Next(size_t max_size_hint,
-                                 grpc_closure* on_complete) {
+bool SliceBufferByteStream::Next(size_t /*max_size_hint*/,
+                                 grpc_closure* /*on_complete*/) {
   GPR_DEBUG_ASSERT(backing_buffer_.count > 0);
   return true;
 }
diff --git a/src/core/lib/transport/connectivity_state.cc b/src/core/lib/transport/connectivity_state.cc
index c553ba240ca..b51fdfdb13d 100644
--- a/src/core/lib/transport/connectivity_state.cc
+++ b/src/core/lib/transport/connectivity_state.cc
@@ -72,7 +72,7 @@ class AsyncConnectivityStateWatcherInterface::Notifier {
   }
 
  private:
-  static void SendNotification(void* arg, grpc_error* ignored) {
+  static void SendNotification(void* arg, grpc_error* /*ignored*/) {
     Notifier* self = static_cast<Notifier*>(arg);
     if (GRPC_TRACE_FLAG_ENABLED(grpc_connectivity_state_trace)) {
       gpr_log(GPR_INFO, "watcher %p: delivering async notification for %s",
diff --git a/src/core/lib/transport/metadata_batch.cc b/src/core/lib/transport/metadata_batch.cc
index 560342cecc6..66749b671c7 100644
--- a/src/core/lib/transport/metadata_batch.cc
+++ b/src/core/lib/transport/metadata_batch.cc
@@ -50,6 +50,9 @@ static void assert_valid_list(grpc_mdelem_list* list) {
     verified_count++;
   }
   GPR_ASSERT(list->count == verified_count);
+#else
+  // Avoid unused-parameter warning for debug-only parameter
+  (void)list;
 #endif /* NDEBUG */
 }
 
@@ -64,6 +67,9 @@ static void assert_valid_callouts(grpc_metadata_batch* batch) {
     }
     grpc_slice_unref_internal(key_interned);
   }
+#else
+  // Avoid unused-parameter warning for debug-only parameter
+  (void)batch;
 #endif
 }