diff --git a/Include/pymath.h b/Include/pymath.h
index d35c87c..b234f97 100644
--- a/Include/pymath.h
+++ b/Include/pymath.h
@@ -43,7 +43,7 @@
 extern double copysign(double, double);
 #endif
 
-/* High precision defintion of pi and e (Euler)
+/* High precision definition of pi and e (Euler)
  * The values are taken from libc6's math.h.
  */
 #ifndef Py_MATH_PIl
diff --git a/Lib/distutils/tests/test_msvc9compiler.py b/Lib/distutils/tests/test_msvc9compiler.py
index 16a95ad..331c0f5 100644
--- a/Lib/distutils/tests/test_msvc9compiler.py
+++ b/Lib/distutils/tests/test_msvc9compiler.py
@@ -125,7 +125,7 @@
         self.assertRaises(KeyError, Reg.get_value, 'xxx', 'xxx')
 
         # looking for values that should exist on all
-        # windows registeries versions.
+        # windows registry versions.
         path = r'Control Panel\Desktop'
         v = Reg.get_value(path, u'dragfullwindows')
         self.assertIn(v, (u'0', u'1', u'2'))
diff --git a/Lib/doctest.py b/Lib/doctest.py
index 6811406..fedf670 100644
--- a/Lib/doctest.py
+++ b/Lib/doctest.py
@@ -219,7 +219,7 @@
     with open(filename, 'U') as f:
         return f.read(), filename
 
-# Use sys.stdout encoding for ouput.
+# Use sys.stdout encoding for output.
 _encoding = getattr(sys.__stdout__, 'encoding', None) or 'utf-8'
 
 def _indent(s, indent=4):
diff --git a/Lib/email/test/test_email.py b/Lib/email/test/test_email.py
index b6be2a2..4b4dee3 100644
--- a/Lib/email/test/test_email.py
+++ b/Lib/email/test/test_email.py
@@ -561,12 +561,12 @@
 
     # Issue 5871: reject an attempt to embed a header inside a header value
     # (header injection attack).
-    def test_embeded_header_via_Header_rejected(self):
+    def test_embedded_header_via_Header_rejected(self):
         msg = Message()
         msg['Dummy'] = Header('dummy\nX-Injected-Header: test')
         self.assertRaises(Errors.HeaderParseError, msg.as_string)
 
-    def test_embeded_header_via_string_rejected(self):
+    def test_embedded_header_via_string_rejected(self):
         msg = Message()
         msg['Dummy'] = 'dummy\nX-Injected-Header: test'
         self.assertRaises(Errors.HeaderParseError, msg.as_string)
diff --git a/Lib/httplib.py b/Lib/httplib.py
index 7223ba1..f32fa4f 100644
--- a/Lib/httplib.py
+++ b/Lib/httplib.py
@@ -242,7 +242,7 @@
 #
 # VCHAR defined in http://tools.ietf.org/html/rfc5234#appendix-B.1
 
-# the patterns for both name and value are more leniant than RFC
+# the patterns for both name and value are more lenient than RFC
 # definitions to allow for backwards compatibility
 _is_legal_header_name = re.compile(r'\A[^:\s][^:\r\n]*\Z').match
 _is_illegal_header_value = re.compile(r'\n(?![ \t])|\r(?![ \t\n])').search
diff --git a/Lib/idlelib/idle_test/test_formatparagraph.py b/Lib/idlelib/idle_test/test_formatparagraph.py
index 938110d..068ae38 100644
--- a/Lib/idlelib/idle_test/test_formatparagraph.py
+++ b/Lib/idlelib/idle_test/test_formatparagraph.py
@@ -159,7 +159,7 @@
 class ReformatFunctionTest(unittest.TestCase):
     """Test the reformat_paragraph function without the editor window."""
 
-    def test_reformat_paragrah(self):
+    def test_reformat_paragraph(self):
         Equal = self.assertEqual
         reform = fp.reformat_paragraph
         hw = "O hello world"
diff --git a/Lib/test/test_datetime.py b/Lib/test/test_datetime.py
index 1f7fb776..20abe74 100644
--- a/Lib/test/test_datetime.py
+++ b/Lib/test/test_datetime.py
@@ -3343,7 +3343,7 @@
         self.assertRaises(TypeError, lambda: as_date >= as_datetime)
         self.assertRaises(TypeError, lambda: as_datetime >= as_date)
 
-        # Neverthelss, comparison should work with the base-class (date)
+        # Nevertheless, comparison should work with the base-class (date)
         # projection if use of a date method is forced.
         self.assertTrue(as_date.__eq__(as_datetime))
         different_day = (as_date.day + 1) % 20 + 1
diff --git a/Lib/test/test_descr.py b/Lib/test/test_descr.py
index 9bc114b..fc965f7 100644
--- a/Lib/test/test_descr.py
+++ b/Lib/test/test_descr.py
@@ -684,7 +684,7 @@
             self.fail("inheriting from ModuleType and str at the same time "
                       "should fail")
 
-    def test_multiple_inheritence(self):
+    def test_multiple_inheritance(self):
         # Testing multiple inheritance...
         class C(object):
             def __init__(self):
@@ -815,7 +815,7 @@
         else:
             self.fail("new class with only classic bases - shouldn't be")
 
-    def test_diamond_inheritence(self):
+    def test_diamond_inheritance(self):
         # Testing multiple inheritance special cases...
         class A(object):
             def spam(self): return "A"
diff --git a/Lib/test/test_pep247.py b/Lib/test/test_pep247.py
index 423d333..7b06d00 100644
--- a/Lib/test/test_pep247.py
+++ b/Lib/test/test_pep247.py
@@ -1,5 +1,5 @@
 """
-Test suite to check compilance with PEP 247, the standard API
+Test suite to check compliance with PEP 247, the standard API
 for hashing algorithms
 """
 
diff --git a/Lib/test/test_py3kwarn.py b/Lib/test/test_py3kwarn.py
index b4e4e9d..efcd1d2 100644
--- a/Lib/test/test_py3kwarn.py
+++ b/Lib/test/test_py3kwarn.py
@@ -270,7 +270,7 @@
             class NoWarningOnlyHash(object):
                 def __hash__(self): pass
             self.assertEqual(len(w.warnings), 0)
-            # With an intermediate class in the heirarchy
+            # With an intermediate class in the hierarchy
             class DefinesAllThree(object):
                 def __cmp__(self, other): pass
                 def __eq__(self, other): pass
diff --git a/Lib/test/test_urllib.py b/Lib/test/test_urllib.py
index 27a1d38..7b1ef6a 100644
--- a/Lib/test/test_urllib.py
+++ b/Lib/test/test_urllib.py
@@ -1,4 +1,4 @@
-"""Regresssion tests for urllib"""
+"""Regression tests for urllib"""
 
 import collections
 import urllib
diff --git a/Lib/test/test_urllib2_localnet.py b/Lib/test/test_urllib2_localnet.py
index bb82b26..51a95dc 100644
--- a/Lib/test/test_urllib2_localnet.py
+++ b/Lib/test/test_urllib2_localnet.py
@@ -93,7 +93,7 @@
         BaseHTTPServer.BaseHTTPRequestHandler.__init__(self, *args, **kwargs)
 
     def log_message(self, format, *args):
-        # Supress the HTTP Console log output
+        # Suppress the HTTP Console log output
         pass
 
     def do_HEAD(self):
diff --git a/Lib/test/test_winreg.py b/Lib/test/test_winreg.py
index 8e3cdf3..7db1f73 100644
--- a/Lib/test/test_winreg.py
+++ b/Lib/test/test_winreg.py
@@ -174,7 +174,7 @@
         DeleteKey(key, "sub_key")
 
         try:
-            # Shouldnt be able to delete it twice!
+            # Shouldn't be able to delete it twice!
             DeleteKey(key, "sub_key")
             self.fail("Deleting the key twice succeeded")
         except EnvironmentError:
diff --git a/Mac/PythonLauncher/MyAppDelegate.m b/Mac/PythonLauncher/MyAppDelegate.m
index e75fb06..25779a2 100644
--- a/Mac/PythonLauncher/MyAppDelegate.m
+++ b/Mac/PythonLauncher/MyAppDelegate.m
@@ -34,7 +34,7 @@
 - (BOOL)shouldShowUI
 {
     // if this call comes before applicationDidFinishLaunching: we
-    // should terminate immedeately after starting the script.
+    // should terminate immediately after starting the script.
     if (!initial_action_done)
         should_terminate = YES;
     initial_action_done = YES;
diff --git a/Misc/HISTORY b/Misc/HISTORY
index a2f5841..fceda8a 100644
--- a/Misc/HISTORY
+++ b/Misc/HISTORY
@@ -1995,7 +1995,7 @@
 - Bug #947906: An object oriented interface has been added to the calendar
   module. It's possible to generate HTML calendar now and the module can be
   called as a script (e.g. via ``python -mcalendar``). Localized month and
-  weekday names can be ouput (even if an exotic encoding is used) using
+  weekday names can be output (even if an exotic encoding is used) using
   special classes that use unicode.
 
 Build
@@ -2378,7 +2378,7 @@
   ``True`` for ``!=``, and raises ``TypeError`` for other comparison
   operators.  Because datetime is a subclass of date, comparing only the
   base class (date) members can still be done, if that's desired, by
-  forcing using of the approprate date method; e.g.,
+  forcing using of the appropriate date method; e.g.,
   ``a_date.__eq__(a_datetime)`` is true if and only if the year, month
   and day members of ``a_date`` and ``a_datetime`` are equal.
 
@@ -12858,7 +12858,7 @@
 
 - copy.py: Make sure the objects returned by __getinitargs__() are
 kept alive (in the memo) to avoid a certain kind of nasty crash.  (Not
-easily reproducable because it requires a later call to
+easily reproducible because it requires a later call to
 __getinitargs__() to return a tuple that happens to be allocated at
 the same address.)
 
@@ -16490,7 +16490,7 @@
 There is now a script to patch Makefile and config.c to add a new
 optional built-in module: Addmodule.sh.  Read the script before using!
 
-Useing Addmodule.sh, all optional modules can now be configured at
+Using Addmodule.sh, all optional modules can now be configured at
 compile time using Configure.py, so there are no modules left that
 require dynamic loading.
 
@@ -16921,9 +16921,9 @@
 
 SUNAUDIODEV: symbolic constant definitions for sunaudiodef (sun only)
 
-SV: symbolic constat definitions for sv (sgi only)
+SV: symbolic constant definitions for sv (sgi only)
 
-CD: symbolic constat definitions for cd (sgi only)
+CD: symbolic constant definitions for cd (sgi only)
 
 
 New demos
diff --git a/Misc/NEWS b/Misc/NEWS
index cc57065..1fc6135 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -2516,7 +2516,7 @@
 
 - Issue #18709: Fix CVE-2013-4238. The SSL module now handles NULL bytes
   inside subjectAltName correctly. Formerly the module has used OpenSSL's
-  GENERAL_NAME_print() function to get the string represention of ASN.1
+  GENERAL_NAME_print() function to get the string representation of ASN.1
   strings for ``rfc822Name`` (email), ``dNSName`` (DNS) and
   ``uniformResourceIdentifier`` (URI).
 
@@ -3147,7 +3147,7 @@
   using the same sys.flags as the current process.  Initial patch by
   Sergey Mezentsev.
 
-- Issue #8862: Fixed curses cleanup when getkey is interrputed by a signal.
+- Issue #8862: Fixed curses cleanup when getkey is interrupted by a signal.
 
 - Issue #9090: When a socket with a timeout fails with EWOULDBLOCK or EAGAIN,
   retry the select() loop instead of bailing out.  This is because select()
@@ -3571,7 +3571,7 @@
 - Issue #14829: Fix bisect issues under 64-bit Windows.
 
 - Issue #14777: tkinter may return undecoded UTF-8 bytes as a string when
-  accessing the Tk clipboard.  Modify clipboad_get() to first request type
+  accessing the Tk clipboard.  Modify clipboard_get() to first request type
   UTF8_STRING when no specific type is requested in an X11 windowing
   environment, falling back to the current default type STRING if that fails.
   Original patch by Thomas Kluyver.
diff --git a/Modules/_ctypes/ctypes.h b/Modules/_ctypes/ctypes.h
index 394534b..b21fe92 100644
--- a/Modules/_ctypes/ctypes.h
+++ b/Modules/_ctypes/ctypes.h
@@ -276,7 +276,7 @@
  StgDictObject function to a generic one.
 
  Currently, PyCFuncPtr types have 'converters' and 'checker' entries in their
- type dict.  They are only used to cache attributes from other entries, whihc
+ type dict.  They are only used to cache attributes from other entries, which
  is wrong.
 
  One use case is the .value attribute that all simple types have.  But some
diff --git a/Modules/_hashopenssl.c b/Modules/_hashopenssl.c
index 443a486..75b3a3d 100644
--- a/Modules/_hashopenssl.c
+++ b/Modules/_hashopenssl.c
@@ -820,7 +820,7 @@
 /*
  *  This macro generates constructor function definitions for specific
  *  hash algorithms.  These constructors are much faster than calling
- *  the generic one passing it a python string and are noticably
+ *  the generic one passing it a python string and are noticeably
  *  faster than calling a python new() wrapper.  Thats important for
  *  code that wants to make hashes of a bunch of small strings.
  */
diff --git a/Modules/_io/iobase.c b/Modules/_io/iobase.c
index 5f7b345..2fec7e8 100644
--- a/Modules/_io/iobase.c
+++ b/Modules/_io/iobase.c
@@ -71,7 +71,7 @@
     return NULL;
 }
 
-/* Positionning */
+/* Positioning */
 
 PyDoc_STRVAR(iobase_seek_doc,
     "Change stream position.\n"
diff --git a/Modules/zipimport.c b/Modules/zipimport.c
index ee44cab..8362983 100644
--- a/Modules/zipimport.c
+++ b/Modules/zipimport.c
@@ -1096,7 +1096,7 @@
     return code;
 }
 
-/* Replace any occurances of "\r\n?" in the input string with "\n".
+/* Replace any occurrences of "\r\n?" in the input string with "\n".
    This converts DOS and Mac line endings to Unix line endings.
    Also append a trailing "\n" to be compatible with
    PyParser_SimpleParseFile(). Returns a new reference. */
diff --git a/Objects/codeobject.c b/Objects/codeobject.c
index c104098..0643c36 100644
--- a/Objects/codeobject.c
+++ b/Objects/codeobject.c
@@ -690,7 +690,7 @@
     /* possible optimization: if f->f_lasti == instr_ub
        (likely to be a common case) then we already know
        instr_lb -- if we stored the matching value of p
-       somwhere we could skip the first while loop. */
+       somewhere we could skip the first while loop. */
 
     /* See lnotab_notes.txt for the description of
        co_lnotab.  A point to remember: increments to p
diff --git a/Objects/listsort.txt b/Objects/listsort.txt
index 08fef96..c6fcb34 100644
--- a/Objects/listsort.txt
+++ b/Objects/listsort.txt
@@ -694,7 +694,7 @@
 
 But in CPython's case, comparisons are extraordinarily expensive compared to
 moving data, and the details matter.  Moving objects is just copying
-pointers.  Comparisons can be arbitrarily expensive (can invoke arbitary
+pointers.  Comparisons can be arbitrarily expensive (can invoke arbitrary
 user-supplied Python code), but even in simple cases (like 3 < 4) _all_
 decisions are made at runtime:  what's the type of the left comparand?  the
 type of the right?  do they need to be coerced to a common type?  where's the
diff --git a/Objects/longobject.c b/Objects/longobject.c
index de2b139..b87546e 100644
--- a/Objects/longobject.c
+++ b/Objects/longobject.c
@@ -211,7 +211,7 @@
 /* Checking for overflow in PyLong_AsLong is a PITA since C doesn't define
  * anything about what happens when a signed integer operation overflows,
  * and some compilers think they're doing you a favor by being "clever"
- * then.  The bit pattern for the largest postive signed long is
+ * then.  The bit pattern for the largest positive signed long is
  * (unsigned long)LONG_MAX, and for the smallest negative signed long
  * it is abs(LONG_MIN), which we could write -(unsigned long)LONG_MIN.
  * However, some other compilers warn about applying unary minus to an
diff --git a/Objects/stringlib/formatter.h b/Objects/stringlib/formatter.h
index 1ac6277..70f574c 100644
--- a/Objects/stringlib/formatter.h
+++ b/Objects/stringlib/formatter.h
@@ -141,7 +141,7 @@
 
 
 #if 0
-/* Occassionally useful for debugging. Should normally be commented out. */
+/* Occasionally useful for debugging. Should normally be commented out. */
 static void
 DEBUG_PRINT_FORMAT_SPEC(InternalFormatSpec *format)
 {
diff --git a/README b/README
index 9b27c32..778fdf9 100644
--- a/README
+++ b/README
@@ -207,7 +207,7 @@
 After this instrumented version of the interpreter is built, the Makefile
 will automatically run a training workload. This is necessary in order to
 profile the interpreter execution. Note also that any output, both stdout
-and stderr, that may appear at this step is supressed.
+and stderr, that may appear at this step is suppressed.
 
 Finally, the last step is to rebuild the interpreter, using the information
 collected in the previous one. The end result will be a Python binary