diff --git a/test/core/transport/chttp2/BUILD b/test/core/transport/chttp2/BUILD
index a50cf84b0c6..b234c8f417f 100644
--- a/test/core/transport/chttp2/BUILD
+++ b/test/core/transport/chttp2/BUILD
@@ -134,6 +134,7 @@ grpc_cc_test(
     external_deps = [
         "gtest",
     ],
+    flaky = True,  # TODO(b/148399919)
     language = "C++",
     deps = [
         "//:gpr",
diff --git a/test/cpp/end2end/BUILD b/test/cpp/end2end/BUILD
index 6116e9e9a05..bc3deabd764 100644
--- a/test/cpp/end2end/BUILD
+++ b/test/cpp/end2end/BUILD
@@ -502,6 +502,7 @@ grpc_cc_test(
     external_deps = [
         "gtest",
     ],
+    flaky = True,  # TODO(b/144705388)
     shard_count = 10,
     tags = [
         "no_test_ios",
diff --git a/test/cpp/microbenchmarks/BUILD b/test/cpp/microbenchmarks/BUILD
index e83a7f6d9d5..e4674fb0d4b 100644
--- a/test/cpp/microbenchmarks/BUILD
+++ b/test/cpp/microbenchmarks/BUILD
@@ -205,6 +205,7 @@ grpc_cc_test(
     srcs = [
         "bm_fullstack_streaming_pump.cc",
     ],
+    flaky = True,  # TODO(b/150422385)
     tags = [
         "no_mac",  # to emulate "excluded_poll_engines: poll"
         "no_windows",
@@ -248,6 +249,7 @@ grpc_cc_test(
 grpc_cc_test(
     name = "bm_metadata",
     srcs = ["bm_metadata.cc"],
+    flaky = True,  # TODO(b/149998903)
     tags = [
         "no_mac",
         "no_windows",