diff --git a/README.rst b/README.rst
index 29a38d5..279a755 100644
--- a/README.rst
+++ b/README.rst
@@ -539,11 +539,11 @@ severity level.
          "program with --v=1 or more";
    VLOG_EVERY_N(1, 10)
       << "I’m printed every 10th occurrence, and when you run the program "
-         "with --v=1 or more. Present occurence is " << google::COUNTER;
+         "with --v=1 or more. Present occurrence is " << google::COUNTER;
    VLOG_IF_EVERY_N(1, (size > 1024), 10)
-      << "I’m printed on every 10th occurence of case when size is more "
+      << "I’m printed on every 10th occurrence of case when size is more "
          " than 1024, when you run the program with --v=1 or more. ";
-         "Present occurence is " << google::COUNTER;
+         "Present occurrence is " << google::COUNTER;
 
 
 Custom Log Prefix Format
diff --git a/cmake/TestPackageConfig.cmake b/cmake/TestPackageConfig.cmake
index 97244ab..9aa5df0 100644
--- a/cmake/TestPackageConfig.cmake
+++ b/cmake/TestPackageConfig.cmake
@@ -21,7 +21,7 @@ execute_process (
   # Capture the PATH environment variable content set during project generation
   # stage. This is required because later during the build stage the PATH is
   # modified again (e.g., for MinGW AppVeyor CI builds) by adding back the
-  # directory containing git.exe. Incidently, the Git installation directory
+  # directory containing git.exe. Incidentally, the Git installation directory
   # also contains sh.exe which causes MinGW Makefile generation to fail.
   COMMAND ${CMAKE_COMMAND} -E env PATH=${PATH}
   ${CMAKE_COMMAND} -C ${INITIAL_CACHE}
diff --git a/src/demangle.cc b/src/demangle.cc
index b19d446..3dde4a6 100644
--- a/src/demangle.cc
+++ b/src/demangle.cc
@@ -294,7 +294,7 @@ static void MaybeAppendWithLength(State *state, const char * const str,
   }
 }
 
-// A convenient wrapper arount MaybeAppendWithLength().
+// A convenient wrapper around MaybeAppendWithLength().
 static bool MaybeAppend(State *state, const char * const str) {
   if (state->append) {
     size_t length = StrLen(str);
diff --git a/src/demangle_unittest.cc b/src/demangle_unittest.cc
index 144781c..ab3653d 100644
--- a/src/demangle_unittest.cc
+++ b/src/demangle_unittest.cc
@@ -80,7 +80,7 @@ TEST(Demangle, Windows) {
 
 #else
 
-// Test corner cases of bounary conditions.
+// Test corner cases of boundary conditions.
 TEST(Demangle, CornerCases) {
   const size_t size = 10;
   char tmp[size] = { 0 };
diff --git a/src/glog/logging.h.in b/src/glog/logging.h.in
index e8e6c41..09f9645 100644
--- a/src/glog/logging.h.in
+++ b/src/glog/logging.h.in
@@ -290,11 +290,11 @@ typedef void(*CustomPrefixCallback)(std::ostream& s, const LogMessageInfo& l, vo
 //         "program with --v=1 or more";
 //   VLOG_EVERY_N(1, 10)
 //      << "I'm printed every 10th occurrence, and when you run the program "
-//         "with --v=1 or more. Present occurence is " << google::COUNTER;
+//         "with --v=1 or more. Present occurrence is " << google::COUNTER;
 //   VLOG_IF_EVERY_N(1, (size > 1024), 10)
-//      << "I'm printed on every 10th occurence of case when size is more "
+//      << "I'm printed on every 10th occurrence of case when size is more "
 //         " than 1024, when you run the program with --v=1 or more. ";
-//         "Present occurence is " << google::COUNTER;
+//         "Present occurrence is " << google::COUNTER;
 //
 // The supported severity levels for macros that allow you to specify one
 // are (in increasing order of severity) INFO, WARNING, ERROR, and FATAL.
@@ -842,7 +842,7 @@ DEFINE_CHECK_OP_IMPL(Check_GT, > )
 #define CHECK_OP_LOG(name, op, val1, val2, log) CHECK((val1) op (val2))
 #elif DCHECK_IS_ON()
 // In debug mode, avoid constructing CheckOpStrings if possible,
-// to reduce the overhead of CHECK statments by 2x.
+// to reduce the overhead of CHECK statements by 2x.
 // Real DCHECK-heavy tests have seen 1.5x speedups.
 
 // The meaning of "string" might be different between now and
@@ -1425,7 +1425,7 @@ public:
   // is so that streaming can be done more efficiently.
   static const size_t kMaxLogMessageLen;
 
-  // Theses should not be called directly outside of logging.*,
+  // These should not be called directly outside of logging.*,
   // only passed as SendMethod arguments to other LogMessage methods:
   void SendToLog();  // Actually dispatch to the logs
   void SendToSyslogAndLog();  // Actually dispatch to syslog and the logs
@@ -1652,8 +1652,8 @@ GLOG_EXPORT void LogToStderr();
 GLOG_EXPORT void SetEmailLogging(LogSeverity min_severity,
                                           const char* addresses);
 
-// A simple function that sends email. dest is a commma-separated
-// list of addressess.  Thread-safe.
+// A simple function that sends email. dest is a comma-separated
+// list of addresses.  Thread-safe.
 GLOG_EXPORT bool SendEmail(const char* dest, const char* subject,
                            const char* body);
 
diff --git a/src/glog/vlog_is_on.h.in b/src/glog/vlog_is_on.h.in
index ed37e0d..15dee61 100644
--- a/src/glog/vlog_is_on.h.in
+++ b/src/glog/vlog_is_on.h.in
@@ -104,7 +104,7 @@ struct SiteFlag {
   SiteFlag* next;
 };
 
-// Helper routine which determines the logging info for a particalur VLOG site.
+// Helper routine which determines the logging info for a particular VLOG site.
 //   site_flag     is the address of the site-local pointer to the controlling
 //                 verbosity level
 //   site_default  is the default to use for *site_flag
diff --git a/src/logging_unittest.cc b/src/logging_unittest.cc
index 61039a3..85e8516 100644
--- a/src/logging_unittest.cc
+++ b/src/logging_unittest.cc
@@ -376,7 +376,7 @@ void TestRawLogging() {
 
   FlagSaver saver;
 
-  // Check that RAW loggging does not use mallocs.
+  // Check that RAW logging does not use mallocs.
   NewHook new_hook;
 
   RAW_LOG(INFO, "%s%s%d%c%f", foo->c_str(), "bar ", 10, ' ', 3.4);
diff --git a/src/stacktrace_powerpc-inl.h b/src/stacktrace_powerpc-inl.h
index 30217db..af95adb 100644
--- a/src/stacktrace_powerpc-inl.h
+++ b/src/stacktrace_powerpc-inl.h
@@ -121,7 +121,7 @@ int GetStackTrace(void** result, int max_depth, int skip_count) {
       // This check is in case the compiler doesn't define _CALL_SYSV.
       result[n++] = *(sp+1);
 #else
-#error Need to specify the PPC ABI for your archiecture.
+#error Need to specify the PPC ABI for your architecture.
 #endif
     }
     // Use strict unwinding rules.
diff --git a/src/utilities.h b/src/utilities.h
index 45e555b..5d8f1c5 100644
--- a/src/utilities.h
+++ b/src/utilities.h
@@ -29,7 +29,7 @@
 //
 // Author: Shinichiro Hamaji
 //
-// Define utilties for glog internal usage.
+// Define utilities for glog internal usage.
 
 #ifndef UTILITIES_H__
 #define UTILITIES_H__
@@ -174,7 +174,7 @@ inline T sync_val_compare_and_swap(T* ptr, T oldval, T newval) {
                        :"=a"(ret)
                         // GCC may produces %sil or %dil for
                         // constraint "r", but some of apple's gas
-                        // dosn't know the 8 bit registers.
+                        // doesn't know the 8 bit registers.
                         // We use "q" to avoid these registers.
                        :"q"(newval), "q"(ptr), "a"(oldval)
                        :"memory", "cc");