diff --git a/test/core/debug/stats_test.cc b/test/core/debug/stats_test.cc
index 8e13898e2c3..f28133d1274 100644
--- a/test/core/debug/stats_test.cc
+++ b/test/core/debug/stats_test.cc
@@ -151,5 +151,9 @@ int main(int argc, char** argv) {
   int ret = RUN_ALL_TESTS();
   grpc_shutdown();
   return ret;
+#else
+  // Avoid unused parameter warning for conditional parameters.
+  (void)argc;
+  (void)argv;
 #endif
 }
diff --git a/test/core/end2end/fixtures/http_proxy_fixture.cc b/test/core/end2end/fixtures/http_proxy_fixture.cc
index 8f8ddcc8a49..90e16dc43c8 100644
--- a/test/core/end2end/fixtures/http_proxy_fixture.cc
+++ b/test/core/end2end/fixtures/http_proxy_fixture.cc
@@ -119,12 +119,14 @@ typedef struct proxy_connection {
   grpc_http_request http_request;
 } proxy_connection;
 
-static void proxy_connection_ref(proxy_connection* conn, const char* reason) {
+static void proxy_connection_ref(proxy_connection* conn,
+                                 const char* /*reason*/) {
   gpr_ref(&conn->refcount);
 }
 
 // Helper function to destroy the proxy connection.
-static void proxy_connection_unref(proxy_connection* conn, const char* reason) {
+static void proxy_connection_unref(proxy_connection* conn,
+                                   const char* /*reason*/) {
   if (gpr_unref(&conn->refcount)) {
     gpr_log(GPR_DEBUG, "endpoints: %p %p", conn->client_endpoint,
             conn->server_endpoint);
@@ -554,7 +556,7 @@ static void on_read_request_done(void* arg, grpc_error* error) {
 }
 
 static void on_accept(void* arg, grpc_endpoint* endpoint,
-                      grpc_pollset* accepting_pollset,
+                      grpc_pollset* /*accepting_pollset*/,
                       grpc_tcp_server_acceptor* acceptor) {
   gpr_free(acceptor);
   grpc_end2end_http_proxy* proxy = static_cast<grpc_end2end_http_proxy*>(arg);
@@ -639,7 +641,7 @@ grpc_end2end_http_proxy* grpc_end2end_http_proxy_create(
   return proxy;
 }
 
-static void destroy_pollset(void* arg, grpc_error* error) {
+static void destroy_pollset(void* arg, grpc_error* /*error*/) {
   grpc_pollset* pollset = static_cast<grpc_pollset*>(arg);
   grpc_pollset_destroy(pollset);
   gpr_free(pollset);
diff --git a/test/core/end2end/fixtures/local_util.cc b/test/core/end2end/fixtures/local_util.cc
index 767f3a28ef8..c1fd88b67b0 100644
--- a/test/core/end2end/fixtures/local_util.cc
+++ b/test/core/end2end/fixtures/local_util.cc
@@ -73,8 +73,9 @@ static bool fail_server_auth_check(grpc_channel_args* server_args) {
   return false;
 }
 
-static void process_auth_failure(void* state, grpc_auth_context* ctx,
-                                 const grpc_metadata* md, size_t md_count,
+static void process_auth_failure(void* state, grpc_auth_context* /*ctx*/,
+                                 const grpc_metadata* /*md*/,
+                                 size_t /*md_count*/,
                                  grpc_process_auth_metadata_done_cb cb,
                                  void* user_data) {
   GPR_ASSERT(state == nullptr);
diff --git a/test/core/end2end/fixtures/proxy.cc b/test/core/end2end/fixtures/proxy.cc
index 4ae7450b0df..3351eab2f3c 100644
--- a/test/core/end2end/fixtures/proxy.cc
+++ b/test/core/end2end/fixtures/proxy.cc
@@ -120,7 +120,7 @@ static closure* new_closure(void (*func)(void* arg, int success), void* arg) {
   return cl;
 }
 
-static void shutdown_complete(void* arg, int success) {
+static void shutdown_complete(void* arg, int /*success*/) {
   grpc_end2end_proxy* proxy = static_cast<grpc_end2end_proxy*>(arg);
   proxy->shutdown = 1;
   grpc_completion_queue_shutdown(proxy->cq);
@@ -137,7 +137,7 @@ void grpc_end2end_proxy_destroy(grpc_end2end_proxy* proxy) {
   grpc_core::Delete(proxy);
 }
 
-static void unrefpc(proxy_call* pc, const char* reason) {
+static void unrefpc(proxy_call* pc, const char* /*reason*/) {
   if (gpr_unref(&pc->refs)) {
     grpc_call_unref(pc->c2p);
     grpc_call_unref(pc->p2s);
@@ -149,14 +149,16 @@ static void unrefpc(proxy_call* pc, const char* reason) {
   }
 }
 
-static void refpc(proxy_call* pc, const char* reason) { gpr_ref(&pc->refs); }
+static void refpc(proxy_call* pc, const char* /*reason*/) {
+  gpr_ref(&pc->refs);
+}
 
-static void on_c2p_sent_initial_metadata(void* arg, int success) {
+static void on_c2p_sent_initial_metadata(void* arg, int /*success*/) {
   proxy_call* pc = static_cast<proxy_call*>(arg);
   unrefpc(pc, "on_c2p_sent_initial_metadata");
 }
 
-static void on_p2s_recv_initial_metadata(void* arg, int success) {
+static void on_p2s_recv_initial_metadata(void* arg, int /*success*/) {
   proxy_call* pc = static_cast<proxy_call*>(arg);
   grpc_op op;
   grpc_call_error err;
@@ -178,7 +180,7 @@ static void on_p2s_recv_initial_metadata(void* arg, int success) {
   unrefpc(pc, "on_p2s_recv_initial_metadata");
 }
 
-static void on_p2s_sent_initial_metadata(void* arg, int success) {
+static void on_p2s_sent_initial_metadata(void* arg, int /*success*/) {
   proxy_call* pc = static_cast<proxy_call*>(arg);
   unrefpc(pc, "on_p2s_sent_initial_metadata");
 }
@@ -205,7 +207,7 @@ static void on_p2s_sent_message(void* arg, int success) {
   unrefpc(pc, "on_p2s_sent_message");
 }
 
-static void on_p2s_sent_close(void* arg, int success) {
+static void on_p2s_sent_close(void* arg, int /*success*/) {
   proxy_call* pc = static_cast<proxy_call*>(arg);
   unrefpc(pc, "on_p2s_sent_close");
 }
@@ -285,7 +287,7 @@ static void on_p2s_recv_msg(void* arg, int success) {
   unrefpc(pc, "on_p2s_recv_msg");
 }
 
-static void on_c2p_sent_status(void* arg, int success) {
+static void on_c2p_sent_status(void* arg, int /*success*/) {
   proxy_call* pc = static_cast<proxy_call*>(arg);
   unrefpc(pc, "on_c2p_sent_status");
 }
@@ -315,7 +317,7 @@ static void on_p2s_status(void* arg, int success) {
   unrefpc(pc, "on_p2s_status");
 }
 
-static void on_c2p_closed(void* arg, int success) {
+static void on_c2p_closed(void* arg, int /*success*/) {
   proxy_call* pc = static_cast<proxy_call*>(arg);
   unrefpc(pc, "on_c2p_closed");
 }
diff --git a/test/core/end2end/tests/cancel_with_status.cc b/test/core/end2end/tests/cancel_with_status.cc
index 2fc9d2ff271..2d6ad771fcc 100644
--- a/test/core/end2end/tests/cancel_with_status.cc
+++ b/test/core/end2end/tests/cancel_with_status.cc
@@ -89,7 +89,7 @@ static void end_test(grpc_end2end_test_fixture* f) {
   grpc_completion_queue_destroy(f->shutdown_cq);
 }
 
-static void simple_request_body(grpc_end2end_test_config config,
+static void simple_request_body(grpc_end2end_test_config /*config*/,
                                 grpc_end2end_test_fixture f, size_t num_ops) {
   grpc_call* c;
   cq_verifier* cqv = cq_verifier_create(f.cq);
diff --git a/test/core/end2end/tests/disappearing_server.cc b/test/core/end2end/tests/disappearing_server.cc
index fdd780f117e..0858ce39597 100644
--- a/test/core/end2end/tests/disappearing_server.cc
+++ b/test/core/end2end/tests/disappearing_server.cc
@@ -68,7 +68,7 @@ static void end_test(grpc_end2end_test_fixture* f) {
   grpc_completion_queue_destroy(f->shutdown_cq);
 }
 
-static void do_request_and_shutdown_server(grpc_end2end_test_config config,
+static void do_request_and_shutdown_server(grpc_end2end_test_config /*config*/,
                                            grpc_end2end_test_fixture* f,
                                            cq_verifier* cqv) {
   grpc_call* c;
diff --git a/test/core/end2end/tests/empty_batch.cc b/test/core/end2end/tests/empty_batch.cc
index 317bb7aeb07..1144ebf1759 100644
--- a/test/core/end2end/tests/empty_batch.cc
+++ b/test/core/end2end/tests/empty_batch.cc
@@ -85,7 +85,7 @@ static void end_test(grpc_end2end_test_fixture* f) {
   grpc_completion_queue_destroy(f->shutdown_cq);
 }
 
-static void empty_batch_body(grpc_end2end_test_config config,
+static void empty_batch_body(grpc_end2end_test_config /*config*/,
                              grpc_end2end_test_fixture f) {
   grpc_call* c;
   cq_verifier* cqv = cq_verifier_create(f.cq);
diff --git a/test/core/end2end/tests/high_initial_seqno.cc b/test/core/end2end/tests/high_initial_seqno.cc
index 18e6ee90ef5..ca6e883ee4d 100644
--- a/test/core/end2end/tests/high_initial_seqno.cc
+++ b/test/core/end2end/tests/high_initial_seqno.cc
@@ -87,7 +87,7 @@ static void end_test(grpc_end2end_test_fixture* f) {
   grpc_completion_queue_destroy(f->shutdown_cq);
 }
 
-static void simple_request_body(grpc_end2end_test_config config,
+static void simple_request_body(grpc_end2end_test_config /*config*/,
                                 grpc_end2end_test_fixture f) {
   grpc_call* c;
   grpc_call* s;
diff --git a/test/core/end2end/tests/hpack_size.cc b/test/core/end2end/tests/hpack_size.cc
index 7c51294e1cc..8f36868d98a 100644
--- a/test/core/end2end/tests/hpack_size.cc
+++ b/test/core/end2end/tests/hpack_size.cc
@@ -228,7 +228,7 @@ static void end_test(grpc_end2end_test_fixture* f) {
   grpc_completion_queue_destroy(f->shutdown_cq);
 }
 
-static void simple_request_body(grpc_end2end_test_config config,
+static void simple_request_body(grpc_end2end_test_config /*config*/,
                                 grpc_end2end_test_fixture f, size_t index) {
   grpc_call* c;
   grpc_call* s;
diff --git a/test/core/end2end/tests/idempotent_request.cc b/test/core/end2end/tests/idempotent_request.cc
index 80908d5210c..5fc087c9e64 100644
--- a/test/core/end2end/tests/idempotent_request.cc
+++ b/test/core/end2end/tests/idempotent_request.cc
@@ -86,7 +86,7 @@ static void end_test(grpc_end2end_test_fixture* f) {
   grpc_completion_queue_destroy(f->shutdown_cq);
 }
 
-static void simple_request_body(grpc_end2end_test_config config,
+static void simple_request_body(grpc_end2end_test_config /*config*/,
                                 grpc_end2end_test_fixture f) {
   grpc_call* c;
   grpc_call* s;