diff --git a/conformance/binary_json_conformance_suite.cc b/conformance/binary_json_conformance_suite.cc
index ded3939122..f62c705f62 100644
--- a/conformance/binary_json_conformance_suite.cc
+++ b/conformance/binary_json_conformance_suite.cc
@@ -364,7 +364,7 @@ bool BinaryAndJsonConformanceSuite::ParseJsonResponse(
 
   if (!test_message->ParseFromString(binary_protobuf)) {
     GOOGLE_LOG(FATAL) << "INTERNAL ERROR: internal JSON->protobuf transcode "
-               << "yielded unparsable proto.";
+               << "yielded unparseable proto.";
     return false;
   }
 
@@ -393,7 +393,7 @@ bool BinaryAndJsonConformanceSuite::ParseResponse(
 
       if (!test_message->ParseFromString(response.protobuf_payload())) {
         ReportFailure(test_name, level, request, response,
-                   "Protobuf output we received from test was unparsable.");
+                   "Protobuf output we received from test was unparseable.");
         return false;
       }
 
@@ -412,7 +412,7 @@ bool BinaryAndJsonConformanceSuite::ParseResponse(
 
       if (!ParseJsonResponse(response, test_message)) {
         ReportFailure(test_name, level, request, response,
-                      "JSON output we received from test was unparsable.");
+                      "JSON output we received from test was unparseable.");
         return false;
       }
 
diff --git a/conformance/text_format_conformance_suite.cc b/conformance/text_format_conformance_suite.cc
index 658aaf5749..6574b10c50 100644
--- a/conformance/text_format_conformance_suite.cc
+++ b/conformance/text_format_conformance_suite.cc
@@ -65,7 +65,7 @@ bool TextFormatConformanceTestSuite::ParseTextFormatResponse(
   }
   if (!parser.ParseFromString(response.text_payload(), test_message)) {
     GOOGLE_LOG(ERROR) << "INTERNAL ERROR: internal text->protobuf transcode "
-               << "yielded unparsable proto. Text payload: "
+               << "yielded unparseable proto. Text payload: "
                << response.text_payload();
     return false;
   }
@@ -94,7 +94,7 @@ bool TextFormatConformanceTestSuite::ParseResponse(
 
       if (!test_message->ParseFromString(response.protobuf_payload())) {
         ReportFailure(test_name, level, request, response,
-                      "Protobuf output we received from test was unparsable.");
+                      "Protobuf output we received from test was unparseable.");
         return false;
       }
 
@@ -114,7 +114,7 @@ bool TextFormatConformanceTestSuite::ParseResponse(
       if (!ParseTextFormatResponse(response, setting, test_message)) {
         ReportFailure(
             test_name, level, request, response,
-            "TEXT_FORMAT output we received from test was unparsable.");
+            "TEXT_FORMAT output we received from test was unparseable.");
         return false;
       }
 
diff --git a/csharp/src/Google.Protobuf/JsonFormatter.cs b/csharp/src/Google.Protobuf/JsonFormatter.cs
index 4bffd58c1f..26fabde1cf 100644
--- a/csharp/src/Google.Protobuf/JsonFormatter.cs
+++ b/csharp/src/Google.Protobuf/JsonFormatter.cs
@@ -181,7 +181,7 @@ namespace Google.Protobuf
         /// is included with the base64 data from the <see cref="Any.Value"/> property of the message.
         /// </para>
         /// <para>The value returned by this method is only designed to be used for diagnostic
-        /// purposes. It may not be parsable by <see cref="JsonParser"/>, and may not be parsable
+        /// purposes. It may not be parseable by <see cref="JsonParser"/>, and may not be parseable
         /// by other Protocol Buffer implementations.</para>
         /// </remarks>
         /// <param name="message">The message to format for diagnostic purposes.</param>
diff --git a/python/google/protobuf/internal/reflection_test.py b/python/google/protobuf/internal/reflection_test.py
index e052776d63..f6d71b2404 100755
--- a/python/google/protobuf/internal/reflection_test.py
+++ b/python/google/protobuf/internal/reflection_test.py
@@ -2791,7 +2791,7 @@ class SerializationTest(unittest.TestCase):
 
     serialized = proto.SerializeToString()
 
-    # The empty message should be parsable with all of the fields
+    # The empty message should be parseable with all of the fields
     # unknown.
     proto2 = unittest_pb2.TestEmptyMessage()
 
@@ -2804,7 +2804,7 @@ class SerializationTest(unittest.TestCase):
     proto = unittest_pb2.TestAllTypes()
     proto.optional_int64 = 0x0fffffffffffffff
     serialized = proto.SerializeToString()
-    # The empty message should be parsable with all of the fields
+    # The empty message should be parseable with all of the fields
     # unknown.
     proto2 = unittest_pb2.TestEmptyMessage()
     # Parsing this message should succeed.
diff --git a/src/google/protobuf/compiler/parser_unittest.cc b/src/google/protobuf/compiler/parser_unittest.cc
index 4a3a228e89..dd945be089 100644
--- a/src/google/protobuf/compiler/parser_unittest.cc
+++ b/src/google/protobuf/compiler/parser_unittest.cc
@@ -2432,7 +2432,7 @@ TEST_F(ParseDescriptorDebugTest, TestMaps) {
   EXPECT_TRUE(debug_string.find("option map_entry") == std::string::npos);
   EXPECT_TRUE(debug_string.find("MapEntry") == std::string::npos);
 
-  // Make sure the descriptor debug string is parsable.
+  // Make sure the descriptor debug string is parseable.
   FileDescriptorProto parsed;
   SetupParser(debug_string.c_str());
   parsed.set_name("foo.proto");
diff --git a/src/google/protobuf/compiler/plugin.cc b/src/google/protobuf/compiler/plugin.cc
index 5fbc0ed4c2..7306cf4449 100644
--- a/src/google/protobuf/compiler/plugin.cc
+++ b/src/google/protobuf/compiler/plugin.cc
@@ -160,7 +160,7 @@ int PluginMain(int argc, char* argv[], const CodeGenerator* generator) {
 
   CodeGeneratorRequest request;
   if (!request.ParseFromFileDescriptor(STDIN_FILENO)) {
-    std::cerr << argv[0] << ": protoc sent unparsable request to plugin."
+    std::cerr << argv[0] << ": protoc sent unparseable request to plugin."
               << std::endl;
     return 1;
   }
diff --git a/src/google/protobuf/compiler/plugin.proto b/src/google/protobuf/compiler/plugin.proto
index 4f551a5dc5..492b896c5b 100644
--- a/src/google/protobuf/compiler/plugin.proto
+++ b/src/google/protobuf/compiler/plugin.proto
@@ -103,7 +103,7 @@ message CodeGeneratorResponse {
   // This should be used to indicate errors in .proto files which prevent the
   // code generator from generating correct code.  Errors which indicate a
   // problem in protoc itself -- such as the input CodeGeneratorRequest being
-  // unparsable -- should be reported by writing a message to stderr and
+  // unparseable -- should be reported by writing a message to stderr and
   // exiting with a non-zero status code.
   optional string error = 1;
 
diff --git a/src/google/protobuf/compiler/subprocess.cc b/src/google/protobuf/compiler/subprocess.cc
index aba538204f..7e59cd7d8d 100644
--- a/src/google/protobuf/compiler/subprocess.cc
+++ b/src/google/protobuf/compiler/subprocess.cc
@@ -260,7 +260,7 @@ bool Subprocess::Communicate(const Message& input, Message* output,
   }
 
   if (!output->ParseFromString(output_data)) {
-    *error = "Plugin output is unparsable: " + CEscape(output_data);
+    *error = "Plugin output is unparseable: " + CEscape(output_data);
     return false;
   }
 
@@ -461,7 +461,7 @@ bool Subprocess::Communicate(const Message& input, Message* output,
   }
 
   if (!output->ParseFromString(output_data)) {
-    *error = "Plugin output is unparsable: " + CEscape(output_data);
+    *error = "Plugin output is unparseable: " + CEscape(output_data);
     return false;
   }
 
diff --git a/src/google/protobuf/descriptor.h b/src/google/protobuf/descriptor.h
index 078f24a68b..7d543ebab0 100644
--- a/src/google/protobuf/descriptor.h
+++ b/src/google/protobuf/descriptor.h
@@ -157,7 +157,7 @@ struct SourceLocation {
   std::vector<std::string> leading_detached_comments;
 };
 
-// Options when generating machine-parsable output from a descriptor with
+// Options when generating machine-parseable output from a descriptor with
 // DebugString().
 struct DebugStringOptions {
   // include original user comments as recorded in SourceLocation entries. N.B.