diff --git a/mediapipe/examples/desktop/autoflip/calculators/border_detection_calculator.cc b/mediapipe/examples/desktop/autoflip/calculators/border_detection_calculator.cc
index 238bcf8b..c3c920bc 100644
--- a/mediapipe/examples/desktop/autoflip/calculators/border_detection_calculator.cc
+++ b/mediapipe/examples/desktop/autoflip/calculators/border_detection_calculator.cc
@@ -28,11 +28,8 @@
 #include "mediapipe/framework/port/ret_check.h"
 #include "mediapipe/framework/port/status.h"
 
-using mediapipe::Adopt;
-using mediapipe::CalculatorBase;
 using mediapipe::ImageFrame;
 using mediapipe::PacketTypeSet;
-using mediapipe::autoflip::Border;
 
 constexpr char kDetectedBorders[] = "DETECTED_BORDERS";
 constexpr int kMinBorderDistance = 5;
diff --git a/mediapipe/examples/desktop/autoflip/calculators/border_detection_calculator_test.cc b/mediapipe/examples/desktop/autoflip/calculators/border_detection_calculator_test.cc
index e72d54e5..431e3d16 100644
--- a/mediapipe/examples/desktop/autoflip/calculators/border_detection_calculator_test.cc
+++ b/mediapipe/examples/desktop/autoflip/calculators/border_detection_calculator_test.cc
@@ -28,16 +28,12 @@
 #include "mediapipe/framework/port/status.h"
 #include "mediapipe/framework/port/status_matchers.h"
 
-using mediapipe::Adopt;
 using mediapipe::CalculatorGraphConfig;
 using mediapipe::CalculatorRunner;
 using mediapipe::ImageFormat;
 using mediapipe::ImageFrame;
 using mediapipe::Packet;
 using mediapipe::PacketTypeSet;
-using mediapipe::ParseTextProtoOrDie;
-using mediapipe::Timestamp;
-using mediapipe::autoflip::Border;
 
 namespace mediapipe {
 namespace autoflip {
diff --git a/mediapipe/examples/desktop/autoflip/calculators/shot_boundary_calculator_test.cc b/mediapipe/examples/desktop/autoflip/calculators/shot_boundary_calculator_test.cc
index 9ea79ba4..a45a171a 100644
--- a/mediapipe/examples/desktop/autoflip/calculators/shot_boundary_calculator_test.cc
+++ b/mediapipe/examples/desktop/autoflip/calculators/shot_boundary_calculator_test.cc
@@ -31,14 +31,11 @@
 #include "mediapipe/framework/port/status.h"
 #include "mediapipe/framework/port/status_matchers.h"
 
-using mediapipe::Adopt;
 using mediapipe::CalculatorGraphConfig;
 using mediapipe::CalculatorRunner;
 using mediapipe::ImageFormat;
 using mediapipe::ImageFrame;
 using mediapipe::PacketTypeSet;
-using mediapipe::ParseTextProtoOrDie;
-using mediapipe::Timestamp;
 
 namespace mediapipe {
 namespace autoflip {
diff --git a/mediapipe/examples/desktop/autoflip/calculators/signal_fusing_calculator.cc b/mediapipe/examples/desktop/autoflip/calculators/signal_fusing_calculator.cc
index 85b2d96f..ba5064a2 100644
--- a/mediapipe/examples/desktop/autoflip/calculators/signal_fusing_calculator.cc
+++ b/mediapipe/examples/desktop/autoflip/calculators/signal_fusing_calculator.cc
@@ -28,8 +28,6 @@
 using mediapipe::Packet;
 using mediapipe::PacketTypeSet;
 using mediapipe::autoflip::DetectionSet;
-using mediapipe::autoflip::SalientRegion;
-using mediapipe::autoflip::SignalType;
 
 constexpr char kIsShotBoundaryTag[] = "IS_SHOT_BOUNDARY";
 constexpr char kSignalInputsTag[] = "SIGNAL";
diff --git a/mediapipe/framework/api2/node_test.cc b/mediapipe/framework/api2/node_test.cc
index a6c1ef7c..152cbb0e 100644
--- a/mediapipe/framework/api2/node_test.cc
+++ b/mediapipe/framework/api2/node_test.cc
@@ -19,8 +19,6 @@ namespace mediapipe {
 namespace api2 {
 namespace test {
 
-using testing::ElementsAre;
-
 // Returns the packet values for a vector of Packets.
 template <typename T>
 std::vector<T> PacketValues(const std::vector<mediapipe::Packet>& packets) {
diff --git a/mediapipe/framework/tool/options_field_util.cc b/mediapipe/framework/tool/options_field_util.cc
index 308932d4..248028c2 100644
--- a/mediapipe/framework/tool/options_field_util.cc
+++ b/mediapipe/framework/tool/options_field_util.cc
@@ -27,10 +27,6 @@ namespace options_field_util {
 
 using ::mediapipe::proto_ns::internal::WireFormatLite;
 using FieldType = WireFormatLite::FieldType;
-using ::mediapipe::proto_ns::io::ArrayInputStream;
-using ::mediapipe::proto_ns::io::CodedInputStream;
-using ::mediapipe::proto_ns::io::CodedOutputStream;
-using ::mediapipe::proto_ns::io::StringOutputStream;
 
 // Utility functions for OptionsFieldUtil.
 namespace {