diff --git a/test/core/iomgr/ev_epollex_linux_test.cc b/test/core/iomgr/ev_epollex_linux_test.cc
index 08a28e0b515..5bc5935a95e 100644
--- a/test/core/iomgr/ev_epollex_linux_test.cc
+++ b/test/core/iomgr/ev_epollex_linux_test.cc
@@ -111,5 +111,5 @@ int main(int argc, char** argv) {
   return 0;
 }
 #else /* defined(GRPC_LINUX_EPOLL_CREATE1) && defined(GRPC_LINUX_EVENTFD) */
-int main(int argc, char** argv) { return 0; }
+int main(int /*argc*/, char** /*argv*/) { return 0; }
 #endif
diff --git a/test/core/iomgr/tcp_client_uv_test.cc b/test/core/iomgr/tcp_client_uv_test.cc
index bde8c2f3539..90a1a432771 100644
--- a/test/core/iomgr/tcp_client_uv_test.cc
+++ b/test/core/iomgr/tcp_client_uv_test.cc
@@ -209,6 +209,6 @@ int main(int argc, char** argv) {
 
 #else /* GRPC_UV */
 
-int main(int argc, char** argv) { return 1; }
+int main(int /*argc*/, char** /*argv*/) { return 1; }
 
 #endif /* GRPC_UV */
diff --git a/test/core/iomgr/tcp_server_uv_test.cc b/test/core/iomgr/tcp_server_uv_test.cc
index 625a18c0cc7..a084cccbb27 100644
--- a/test/core/iomgr/tcp_server_uv_test.cc
+++ b/test/core/iomgr/tcp_server_uv_test.cc
@@ -314,6 +314,6 @@ int main(int argc, char** argv) {
 
 #else /* GRPC_UV */
 
-int main(int argc, char** argv) { return 1; }
+int main(int /*argc*/, char** /*argv*/) { return 1; }
 
 #endif /* GRPC_UV */
diff --git a/test/core/json/json_stream_error_test.cc b/test/core/json/json_stream_error_test.cc
index 53e20be2069..f31e9c95d86 100644
--- a/test/core/json/json_stream_error_test.cc
+++ b/test/core/json/json_stream_error_test.cc
@@ -28,12 +28,14 @@
 
 static int g_string_clear_once = 0;
 
-static void string_clear(void* userdata) {
+static void string_clear(void* /*userdata*/) {
   GPR_ASSERT(!g_string_clear_once);
   g_string_clear_once = 1;
 }
 
-static uint32_t read_char(void* userdata) { return GRPC_JSON_READ_CHAR_ERROR; }
+static uint32_t read_char(void* /*userdata*/) {
+  return GRPC_JSON_READ_CHAR_ERROR;
+}
 
 static grpc_json_reader_vtable reader_vtable = {
     string_clear, nullptr, nullptr, read_char, nullptr, nullptr,
diff --git a/test/core/security/check_gcp_environment_linux_test.cc b/test/core/security/check_gcp_environment_linux_test.cc
index b01471abd34..2f266cb4001 100644
--- a/test/core/security/check_gcp_environment_linux_test.cc
+++ b/test/core/security/check_gcp_environment_linux_test.cc
@@ -72,7 +72,7 @@ static void test_gcp_environment_check_failure() {
   GPR_ASSERT(!check_bios_data_linux_test("\n"));
 }
 
-int main(int argc, char** argv) {
+int main(int /*argc*/, char** /*argv*/) {
   /* Tests. */
   test_gcp_environment_check_success();
   test_gcp_environment_check_failure();
@@ -81,6 +81,6 @@ int main(int argc, char** argv) {
 
 #else  // GPR_LINUX
 
-int main(int argc, char** argv) { return 0; }
+int main(int /*argc*/, char** /*argv*/) { return 0; }
 
 #endif  // GPR_LINUX
diff --git a/test/core/security/check_gcp_environment_windows_test.cc b/test/core/security/check_gcp_environment_windows_test.cc
index 2b9407e8cad..0f08e7106ec 100644
--- a/test/core/security/check_gcp_environment_windows_test.cc
+++ b/test/core/security/check_gcp_environment_windows_test.cc
@@ -68,6 +68,6 @@ int main(int argc, char** argv) {
 }
 #else  // GPR_WINDOWS
 
-int main(int argc, char** argv) { return 0; }
+int main(int /*argc*/, char** /*argv*/) { return 0; }
 
 #endif  // GPR_WINDOWS
diff --git a/test/core/security/grpc_alts_credentials_options_test.cc b/test/core/security/grpc_alts_credentials_options_test.cc
index 623db48ebca..d33b59191d2 100644
--- a/test/core/security/grpc_alts_credentials_options_test.cc
+++ b/test/core/security/grpc_alts_credentials_options_test.cc
@@ -87,7 +87,7 @@ static void test_client_options_api_success() {
   grpc_alts_credentials_options_destroy(new_options);
 }
 
-int main(int argc, char** argv) {
+int main(int /*argc*/, char** /*argv*/) {
   /* Test. */
   test_copy_client_options_failure();
   test_client_options_api_success();
diff --git a/test/core/security/oauth2_utils.cc b/test/core/security/oauth2_utils.cc
index 8b4c795a9ff..cab06f90ff1 100644
--- a/test/core/security/oauth2_utils.cc
+++ b/test/core/security/oauth2_utils.cc
@@ -63,7 +63,7 @@ static void on_oauth2_response(void* arg, grpc_error* error) {
   gpr_mu_unlock(request->mu);
 }
 
-static void destroy_after_shutdown(void* pollset, grpc_error* error) {
+static void destroy_after_shutdown(void* pollset, grpc_error* /*error*/) {
   grpc_pollset_destroy(reinterpret_cast<grpc_pollset*>(pollset));
   gpr_free(pollset);
 }
diff --git a/test/core/transport/chttp2/bin_encoder_test.cc b/test/core/transport/chttp2/bin_encoder_test.cc
index bd62b0e479a..9702838c842 100644
--- a/test/core/transport/chttp2/bin_encoder_test.cc
+++ b/test/core/transport/chttp2/bin_encoder_test.cc
@@ -98,7 +98,7 @@ static void expect_binary_header(const char* hdr, int binary) {
   }
 }
 
-int main(int argc, char** argv) {
+int main(int /*argc*/, char** /*argv*/) {
   grpc_init();
 
   /* Base64 test vectors from RFC 4648, with padding removed */