diff --git a/include/grpcpp/impl/codegen/completion_queue_impl.h b/include/grpcpp/impl/codegen/completion_queue_impl.h
index 502edfd9f15..c65b12197dc 100644
--- a/include/grpcpp/impl/codegen/completion_queue_impl.h
+++ b/include/grpcpp/impl/codegen/completion_queue_impl.h
@@ -387,12 +387,14 @@ class CompletionQueue : private ::grpc::GrpcLibraryCodegen {
   }
 
   void RegisterServer(const Server* server) {
+    (void)server;
 #ifndef NDEBUG
     grpc::internal::MutexLock l(&server_list_mutex_);
     server_list_.push_back(server);
 #endif
   }
   void UnregisterServer(const Server* server) {
+    (void)server;
 #ifndef NDEBUG
     grpc::internal::MutexLock l(&server_list_mutex_);
     server_list_.remove(server);
diff --git a/src/core/lib/iomgr/tcp_posix.cc b/src/core/lib/iomgr/tcp_posix.cc
index c96031183b3..bd0562bfa74 100644
--- a/src/core/lib/iomgr/tcp_posix.cc
+++ b/src/core/lib/iomgr/tcp_posix.cc
@@ -1385,7 +1385,8 @@ static bool do_tcp_flush_zerocopy(grpc_tcp* tcp, TcpZerocopySendRecord* record,
 
 static void UnrefMaybePutZerocopySendRecord(grpc_tcp* tcp,
                                             TcpZerocopySendRecord* record,
-                                            uint32_t seq, const char* tag) {
+                                            uint32_t seq,
+                                            const char* /* tag */) {
   if (record->Unref()) {
     tcp->tcp_zerocopy_send_ctx.PutSendRecord(record);
   }
diff --git a/src/core/lib/security/security_connector/local/local_security_connector.cc b/src/core/lib/security/security_connector/local/local_security_connector.cc
index 6fb770d7ade..f2e4e0c36d9 100644
--- a/src/core/lib/security/security_connector/local/local_security_connector.cc
+++ b/src/core/lib/security/security_connector/local/local_security_connector.cc
@@ -66,8 +66,7 @@ grpc_core::RefCountedPtr<grpc_auth_context> local_auth_context_create(
   return ctx;
 }
 
-void local_check_peer(grpc_security_connector* sc, tsi_peer peer,
-                      grpc_endpoint* ep,
+void local_check_peer(tsi_peer peer, grpc_endpoint* ep,
                       grpc_core::RefCountedPtr<grpc_auth_context>* auth_context,
                       grpc_closure* on_peer_checked,
                       grpc_local_connect_type type) {
@@ -178,7 +177,7 @@ class grpc_local_channel_security_connector final
                   grpc_closure* on_peer_checked) override {
     grpc_local_credentials* creds =
         reinterpret_cast<grpc_local_credentials*>(mutable_channel_creds());
-    local_check_peer(this, peer, ep, auth_context, on_peer_checked,
+    local_check_peer(peer, ep, auth_context, on_peer_checked,
                      creds->connect_type());
   }
 
@@ -227,7 +226,7 @@ class grpc_local_server_security_connector final
                   grpc_closure* on_peer_checked) override {
     grpc_local_server_credentials* creds =
         static_cast<grpc_local_server_credentials*>(mutable_server_creds());
-    local_check_peer(this, peer, ep, auth_context, on_peer_checked,
+    local_check_peer(peer, ep, auth_context, on_peer_checked,
                      creds->connect_type());
   }
 
diff --git a/src/core/tsi/alts/handshaker/alts_handshaker_client.cc b/src/core/tsi/alts/handshaker/alts_handshaker_client.cc
index ec17b962972..2592763e5a2 100644
--- a/src/core/tsi/alts/handshaker/alts_handshaker_client.cc
+++ b/src/core/tsi/alts/handshaker/alts_handshaker_client.cc
@@ -637,7 +637,7 @@ static void handshaker_client_shutdown(alts_handshaker_client* c) {
   }
 }
 
-static void handshaker_call_unref(void* arg, grpc_error* error) {
+static void handshaker_call_unref(void* arg, grpc_error* /* error */) {
   grpc_call* call = static_cast<grpc_call*>(arg);
   grpc_call_unref(call);
 }
diff --git a/src/core/tsi/alts/handshaker/alts_tsi_handshaker.cc b/src/core/tsi/alts/handshaker/alts_tsi_handshaker.cc
index b24ed1f24ab..0c700306d8f 100644
--- a/src/core/tsi/alts/handshaker/alts_tsi_handshaker.cc
+++ b/src/core/tsi/alts/handshaker/alts_tsi_handshaker.cc
@@ -430,7 +430,7 @@ struct alts_tsi_handshaker_continue_handshaker_next_args {
 };
 
 static void alts_tsi_handshaker_create_channel(void* arg,
-                                               grpc_error* unused_error) {
+                                               grpc_error* /* unused_error */) {
   alts_tsi_handshaker_continue_handshaker_next_args* next_args =
       static_cast<alts_tsi_handshaker_continue_handshaker_next_args*>(arg);
   alts_tsi_handshaker* handshaker = next_args->handshaker;