diff --git a/test/cpp/interop/xds_interop_client.cc b/test/cpp/interop/xds_interop_client.cc
index c76aac186e0ff..61a45442fa8e1 100644
--- a/test/cpp/interop/xds_interop_client.cc
+++ b/test/cpp/interop/xds_interop_client.cc
@@ -82,6 +82,8 @@ ABSL_FLAG(
     "If true, XdsCredentials are used, InsecureChannelCredentials otherwise");
 ABSL_FLAG(bool, enable_csm_observability, false,
           "Whether to enable CSM Observability");
+ABSL_FLAG(bool, log_rpc_start_and_end, false,
+          "Whether to log when RPCs start and end.");
 
 using grpc::Channel;
 using grpc::ClientAsyncResponseReader;
@@ -156,6 +158,9 @@ class TestClient {
                                  ? config.timeout_sec
                                  : absl::GetFlag(FLAGS_rpc_timeout_sec));
     AsyncClientCall* call = new AsyncClientCall;
+    if (absl::GetFlag(FLAGS_log_rpc_start_and_end)) {
+      LOG(INFO) << "starting async unary call " << static_cast<void*>(call);
+    }
     for (const auto& data : config.metadata) {
       call->context.AddMetadata(data.first, data.second);
       // TODO(@donnadionne): move deadline to separate proto.
@@ -195,6 +200,9 @@ class TestClient {
                                  ? config.timeout_sec
                                  : absl::GetFlag(FLAGS_rpc_timeout_sec));
     AsyncClientCall* call = new AsyncClientCall;
+    if (absl::GetFlag(FLAGS_log_rpc_start_and_end)) {
+      LOG(INFO) << "starting async empty call " << static_cast<void*>(call);
+    }
     for (const auto& data : config.metadata) {
       call->context.AddMetadata(data.first, data.second);
       // TODO(@donnadionne): move deadline to separate proto.
@@ -219,6 +227,9 @@ class TestClient {
     while (cq_.Next(&got_tag, &ok)) {
       AsyncClientCall* call = static_cast<AsyncClientCall*>(got_tag);
       CHECK(ok);
+      if (absl::GetFlag(FLAGS_log_rpc_start_and_end)) {
+        LOG(INFO) << "completed async call " << static_cast<void*>(call);
+      }
       {
         std::lock_guard<std::mutex> lock(stats_watchers_->mu);
         auto server_initial_metadata = call->context.GetServerInitialMetadata();