diff --git a/googletest/Makefile.am b/googletest/Makefile.am
index 29797e4e..dbc004de 100644
--- a/googletest/Makefile.am
+++ b/googletest/Makefile.am
@@ -216,7 +216,7 @@ pkginclude_internal_HEADERS = \
 lib_libgtest_main_la_SOURCES = src/gtest_main.cc
 lib_libgtest_main_la_LIBADD = lib/libgtest.la
 
-# Bulid rules for samples and tests. Automake's naming for some of
+# Build rules for samples and tests. Automake's naming for some of
 # these variables isn't terribly obvious, so this is a brief
 # reference:
 #
diff --git a/googletest/samples/sample1.cc b/googletest/samples/sample1.cc
index f171e260..7c08b28f 100644
--- a/googletest/samples/sample1.cc
+++ b/googletest/samples/sample1.cc
@@ -55,7 +55,7 @@ bool IsPrime(int n) {
 
   // Try to divide n by every odd number i, starting from 3
   for (int i = 3; ; i += 2) {
-    // We only have to try i up to the squre root of n
+    // We only have to try i up to the square root of n
     if (i > n/i) break;
 
     // Now, we have i <= n/i < n.
diff --git a/googletest/scripts/upload.py b/googletest/scripts/upload.py
index 6e6f9a14..81e8e04d 100755
--- a/googletest/scripts/upload.py
+++ b/googletest/scripts/upload.py
@@ -732,7 +732,7 @@ class SubversionVCS(VersionControlSystem):
     else:
       self.rev_start = self.rev_end = None
     # Cache output from "svn list -r REVNO dirname".
-    # Keys: dirname, Values: 2-tuple (ouput for start rev and end rev).
+    # Keys: dirname, Values: 2-tuple (output for start rev and end rev).
     self.svnls_cache = {}
     # SVN base URL is required to fetch files deleted in an older revision.
     # Result is cached to not guess it over and over again in GetBaseFile().
diff --git a/googletest/src/gtest.cc b/googletest/src/gtest.cc
index 4aed0e1c..e04a1c67 100644
--- a/googletest/src/gtest.cc
+++ b/googletest/src/gtest.cc
@@ -1168,7 +1168,7 @@ class Hunk {
   // Print a unified diff header for one hunk.
   // The format is
   //   "@@ -<left_start>,<left_length> +<right_start>,<right_length> @@"
-  // where the left/right parts are ommitted if unnecessary.
+  // where the left/right parts are omitted if unnecessary.
   void PrintHeader(std::ostream* ss) const {
     *ss << "@@ ";
     if (removes_) {
diff --git a/googletest/test/gtest-port_test.cc b/googletest/test/gtest-port_test.cc
index c5067a40..1d25ee6b 100644
--- a/googletest/test/gtest-port_test.cc
+++ b/googletest/test/gtest-port_test.cc
@@ -1209,7 +1209,7 @@ class DestructorTracker {
       : index_(GetNewIndex()) {}
   ~DestructorTracker() {
     // We never access DestructorCall::List() concurrently, so we don't need
-    // to protect this acccess with a mutex.
+    // to protect this access with a mutex.
     DestructorCall::List()[index_]->ReportDestroyed();
   }
 
diff --git a/googletest/test/gtest_test_utils.py b/googletest/test/gtest_test_utils.py
index 4acd36c9..d2b6748d 100755
--- a/googletest/test/gtest_test_utils.py
+++ b/googletest/test/gtest_test_utils.py
@@ -245,7 +245,7 @@ class Subprocess:
       p = subprocess.Popen(command,
                            stdout=subprocess.PIPE, stderr=stderr,
                            cwd=working_dir, universal_newlines=True, env=env)
-      # communicate returns a tuple with the file obect for the child's
+      # communicate returns a tuple with the file object for the child's
       # output.
       self.output = p.communicate()[0]
       self._return_code = p.returncode
diff --git a/googletest/test/gtest_unittest.cc b/googletest/test/gtest_unittest.cc
index 7673f3ea..1d3c7c7a 100644
--- a/googletest/test/gtest_unittest.cc
+++ b/googletest/test/gtest_unittest.cc
@@ -3689,7 +3689,7 @@ TEST(AssertionTest, ASSERT_EQ) {
 TEST(AssertionTest, ASSERT_EQ_NULL) {
   // A success.
   const char* p = NULL;
-  // Some older GCC versions may issue a spurious waring in this or the next
+  // Some older GCC versions may issue a spurious warning in this or the next
   // assertion statement. This warning should not be suppressed with
   // static_cast since the test verifies the ability to use bare NULL as the
   // expected parameter to the macro.
diff --git a/googletest/test/gtest_xml_outfiles_test.py b/googletest/test/gtest_xml_outfiles_test.py
index 524e437e..678f546c 100755
--- a/googletest/test/gtest_xml_outfiles_test.py
+++ b/googletest/test/gtest_xml_outfiles_test.py
@@ -105,7 +105,7 @@ class GTestXMLOutFilesTest(gtest_xml_test_utils.GTestXMLTestCase):
 
     # TODO(wan@google.com): libtool causes the built test binary to be
     #   named lt-gtest_xml_outfiles_test_ instead of
-    #   gtest_xml_outfiles_test_.  To account for this possibillity, we
+    #   gtest_xml_outfiles_test_.  To account for this possibility, we
     #   allow both names in the following code.  We should remove this
     #   hack when Chandler Carruth's libtool replacement tool is ready.
     output_file_name1 = test_name + ".xml"
diff --git a/googletest/test/gtest_xml_output_unittest.py b/googletest/test/gtest_xml_output_unittest.py
index bcd59759..e940a5aa 100755
--- a/googletest/test/gtest_xml_output_unittest.py
+++ b/googletest/test/gtest_xml_output_unittest.py
@@ -237,7 +237,7 @@ class GTestXMLOutputUnitTest(gtest_xml_test_utils.GTestXMLTestCase):
                '--shut_down_xml']
     p = gtest_test_utils.Subprocess(command)
     if p.terminated_by_signal:
-      # p.signal is avalable only if p.terminated_by_signal is True.
+      # p.signal is available only if p.terminated_by_signal is True.
       self.assertFalse(
           p.terminated_by_signal,
           '%s was killed by signal %d' % (GTEST_PROGRAM_NAME, p.signal))
diff --git a/googletest/xcode/Scripts/versiongenerate.py b/googletest/xcode/Scripts/versiongenerate.py
index dba08e9a..16791d25 100755
--- a/googletest/xcode/Scripts/versiongenerate.py
+++ b/googletest/xcode/Scripts/versiongenerate.py
@@ -42,7 +42,7 @@
     1. The AC_INIT macro will be contained within the first 1024 characters
        of configure.ac
     2. The version string will be 3 integers separated by periods and will be
-       surrounded by squre brackets, "[" and "]" (e.g. [1.0.1]). The first
+       surrounded by square brackets, "[" and "]" (e.g. [1.0.1]). The first
        segment represents the major version, the second represents the minor
        version and the third represents the fix version.
     3. No ")" character exists between the opening "(" and closing ")" of
@@ -68,7 +68,7 @@ config_file.close()
 
 # Extract the version string from the AC_INIT macro
 #   The following init_expression means:
-#     Extract three integers separated by periods and surrounded by squre
+#     Extract three integers separated by periods and surrounded by square
 #     brackets(e.g. "[1.0.1]") between "AC_INIT(" and ")". Do not be greedy
 #     (*? is the non-greedy flag) since that would pull in everything between
 #     the first "(" and the last ")" in the file.