diff --git a/examples/oauth/client/main.go b/examples/oauth/client/main.go
index bb8498ac8..d167c43e6 100644
--- a/examples/oauth/client/main.go
+++ b/examples/oauth/client/main.go
@@ -36,7 +36,7 @@ func main() {
 	perRPC := oauth.NewOauthAccess(fetchToken())
 	opts := []grpc.DialOption{
 		// In addition to the following grpc.DialOption, callers may also use
-		// the grpc.CallOption grpc.PerRPCCredentials with the RPC invokation
+		// the grpc.CallOption grpc.PerRPCCredentials with the RPC invocation
 		// itself.
 		// See: https://godoc.org/google.golang.org/grpc#PerRPCCredentials
 		grpc.WithPerRPCCredentials(perRPC),
diff --git a/test/channelz_test.go b/test/channelz_test.go
index 82f1a8f09..86ec3f102 100644
--- a/test/channelz_test.go
+++ b/test/channelz_test.go
@@ -790,7 +790,7 @@ func doServerSideInitiatedFailedStreamWithClientBreakFlowControl(tc testpb.TestS
 	if err != nil {
 		t.Fatalf("TestService/FullDuplexCall(_) = _, %v, want <nil>", err)
 	}
-	// sleep here to make sure header frame being sent before the the data frame we write directly below.
+	// sleep here to make sure header frame being sent before the data frame we write directly below.
 	time.Sleep(10 * time.Millisecond)
 	payload := make([]byte, 65537, 65537)
 	dw.getRawConnWrapper().writeRawFrame(http2.FrameData, 0, tc.(*testServiceClientWrapper).getCurrentStreamID(), payload)
diff --git a/transport/controlbuf.go b/transport/controlbuf.go
index 72e025cc0..e147cd51b 100644
--- a/transport/controlbuf.go
+++ b/transport/controlbuf.go
@@ -573,7 +573,7 @@ func (l *loopyWriter) pingHandler(p *ping) error {
 
 }
 
-func (l *loopyWriter) outFlowControlSizeRequestHanlder(o *outFlowControlSizeRequest) error {
+func (l *loopyWriter) outFlowControlSizeRequestHandler(o *outFlowControlSizeRequest) error {
 	o.resp <- l.sendQuota
 	return nil
 }
@@ -643,7 +643,7 @@ func (l *loopyWriter) handle(i interface{}) error {
 	case *goAway:
 		return l.goAwayHandler(i)
 	case *outFlowControlSizeRequest:
-		return l.outFlowControlSizeRequestHanlder(i)
+		return l.outFlowControlSizeRequestHandler(i)
 	default:
 		return fmt.Errorf("transport: unknown control message type %T", i)
 	}