diff --git a/src/_pytest/_code/code.py b/src/_pytest/_code/code.py
index b778c0db605..19d2a0e706a 100644
--- a/src/_pytest/_code/code.py
+++ b/src/_pytest/_code/code.py
@@ -137,7 +137,7 @@ def eval(self, code, **vars):
     def exec_(self, code, **vars):
         """ exec 'code' in the frame
 
-            'vars' are optiona; additional local variables
+            'vars' are optional; additional local variables
         """
         f_locals = self.f_locals.copy()
         f_locals.update(vars)
@@ -207,7 +207,7 @@ def path(self):
 
     @property
     def locals(self):
-        """ locals of underlaying frame """
+        """ locals of underlying frame """
         return self.frame.f_locals
 
     def getfirstlinesource(self):
@@ -274,7 +274,7 @@ def __str__(self):
 
     @property
     def name(self):
-        """ co_name of underlaying code """
+        """ co_name of underlying code """
         return self.frame.code.raw.co_name
 
 
@@ -302,7 +302,7 @@ def f(cur):
     def cut(self, path=None, lineno=None, firstlineno=None, excludepath=None):
         """ return a Traceback instance wrapping part of this Traceback
 
-            by provding any combination of path, lineno and firstlineno, the
+            by providing any combination of path, lineno and firstlineno, the
             first frame to start the to-be-returned traceback is determined
 
             this allows cutting the first part of a Traceback instance e.g.
@@ -1003,7 +1003,7 @@ def __init__(self, path, lineno, message):
 
     def toterminal(self, tw):
         # filename and lineno output for each entry,
-        # using an output format that most editors unterstand
+        # using an output format that most editors understand
         msg = self.message
         i = msg.find("\n")
         if i != -1:
diff --git a/src/_pytest/junitxml.py b/src/_pytest/junitxml.py
index ba0f48ed39d..fb951106fc4 100644
--- a/src/_pytest/junitxml.py
+++ b/src/_pytest/junitxml.py
@@ -513,7 +513,7 @@ def node_reporter(self, report):
         key = nodeid, slavenode
 
         if key in self.node_reporters:
-            # TODO: breasks for --dist=each
+            # TODO: breaks for --dist=each
             return self.node_reporters[key]
 
         reporter = _NodeReporter(nodeid, self)
diff --git a/src/_pytest/main.py b/src/_pytest/main.py
index ad65ed29929..3c205027d9f 100644
--- a/src/_pytest/main.py
+++ b/src/_pytest/main.py
@@ -429,7 +429,7 @@ def gethookproxy(self, fspath):
             # one or more conftests are not in use at this fspath
             proxy = FSHookProxy(fspath, pm, remove_mods)
         else:
-            # all plugis are active for this fspath
+            # all plugins are active for this fspath
             proxy = self.config.hook
         return proxy
 
diff --git a/src/_pytest/mark/evaluate.py b/src/_pytest/mark/evaluate.py
index b9f2d61f835..53822e98f08 100644
--- a/src/_pytest/mark/evaluate.py
+++ b/src/_pytest/mark/evaluate.py
@@ -28,7 +28,7 @@ def __init__(self, item, name):
         self._mark_name = name
 
     def __bool__(self):
-        # dont cache here to prevent staleness
+        # don't cache here to prevent staleness
         return bool(self._get_marks())
 
     __nonzero__ = __bool__
diff --git a/src/_pytest/mark/legacy.py b/src/_pytest/mark/legacy.py
index d14ea3a8274..3721e3b0219 100644
--- a/src/_pytest/mark/legacy.py
+++ b/src/_pytest/mark/legacy.py
@@ -1,6 +1,6 @@
 """
 this is a place where we put datastructures used by legacy apis
-we hope ot remove
+we hope to remove
 """
 import keyword
 
diff --git a/src/_pytest/python.py b/src/_pytest/python.py
index 913a93bc025..5b8c6adb062 100644
--- a/src/_pytest/python.py
+++ b/src/_pytest/python.py
@@ -210,8 +210,8 @@ def pytest_pycollect_makeitem(collector, name, obj):
         # mock seems to store unbound methods (issue473), normalize it
         obj = getattr(obj, "__func__", obj)
         # We need to try and unwrap the function if it's a functools.partial
-        # or a funtools.wrapped.
-        # We musn't if it's been wrapped with mock.patch (python 2 only)
+        # or a functools.wrapped.
+        # We mustn't if it's been wrapped with mock.patch (python 2 only)
         if not (inspect.isfunction(obj) or inspect.isfunction(get_real_func(obj))):
             filename, lineno = getfslineno(obj)
             warnings.warn_explicit(
@@ -595,7 +595,7 @@ def gethookproxy(self, fspath):
             # one or more conftests are not in use at this fspath
             proxy = FSHookProxy(fspath, pm, remove_mods)
         else:
-            # all plugis are active for this fspath
+            # all plugins are active for this fspath
             proxy = self.config.hook
         return proxy
 
diff --git a/src/_pytest/skipping.py b/src/_pytest/skipping.py
index 53737816f5c..d18f61ef4f8 100644
--- a/src/_pytest/skipping.py
+++ b/src/_pytest/skipping.py
@@ -122,7 +122,7 @@ def pytest_runtest_makereport(item, call):
     outcome = yield
     rep = outcome.get_result()
     evalxfail = getattr(item, "_evalxfail", None)
-    # unitttest special case, see setting of _unexpectedsuccess
+    # unittest special case, see setting of _unexpectedsuccess
     if hasattr(item, "_unexpectedsuccess") and rep.when == "call":
 
         if item._unexpectedsuccess:
@@ -132,7 +132,7 @@ def pytest_runtest_makereport(item, call):
         rep.outcome = "failed"
 
     elif item.config.option.runxfail:
-        pass  # don't interefere
+        pass  # don't interfere
     elif call.excinfo and call.excinfo.errisinstance(xfail.Exception):
         rep.wasxfail = "reason: " + call.excinfo.value.msg
         rep.outcome = "skipped"
diff --git a/testing/python/metafunc.py b/testing/python/metafunc.py
index 4273ab7962a..5becb0f8c9f 100644
--- a/testing/python/metafunc.py
+++ b/testing/python/metafunc.py
@@ -15,7 +15,7 @@ class TestMetafunc:
     def Metafunc(self, func, config=None):
         # the unit tests of this class check if things work correctly
         # on the funcarg level, so we don't need a full blown
-        # initiliazation
+        # initialization
         class FixtureInfo:
             name2fixturedefs = None
 
diff --git a/testing/test_mark.py b/testing/test_mark.py
index c8d5851ac64..764d523a36c 100644
--- a/testing/test_mark.py
+++ b/testing/test_mark.py
@@ -482,7 +482,7 @@ class TestOtherSub(TestBase):
         items, rec = testdir.inline_genitems(p)
         base_item, sub_item, sub_item_other = items
         print(items, [x.nodeid for x in items])
-        # new api seregates
+        # new api segregates
         assert not list(base_item.iter_markers(name="b"))
         assert not list(sub_item_other.iter_markers(name="b"))
         assert list(sub_item.iter_markers(name="b"))
diff --git a/testing/test_nose.py b/testing/test_nose.py
index 16d8d1fc0e0..8a30755c952 100644
--- a/testing/test_nose.py
+++ b/testing/test_nose.py
@@ -229,7 +229,7 @@ def test_first(self):
 
 def test_apiwrapper_problem_issue260(testdir):
     # this would end up trying a call an optional teardown on the class
-    # for plain unittests we dont want nose behaviour
+    # for plain unittests we don't want nose behaviour
     testdir.makepyfile(
         """
         import unittest
diff --git a/testing/test_parseopt.py b/testing/test_parseopt.py
index d39065b8270..915747378f5 100644
--- a/testing/test_parseopt.py
+++ b/testing/test_parseopt.py
@@ -304,7 +304,7 @@ def test_argcomplete(testdir, monkeypatch):
                 shlex.quote(sys.executable)
             )
         )
-    # alternative would be exteneded Testdir.{run(),_run(),popen()} to be able
+    # alternative would be extended Testdir.{run(),_run(),popen()} to be able
     # to handle a keyword argument env that replaces os.environ in popen or
     # extends the copy, advantage: could not forget to restore
     monkeypatch.setenv("_ARGCOMPLETE", "1")
diff --git a/testing/test_pdb.py b/testing/test_pdb.py
index d86ba396bee..55a7230f4d1 100644
--- a/testing/test_pdb.py
+++ b/testing/test_pdb.py
@@ -581,7 +581,7 @@ def test_1():
         # No extra newline.
         assert child.before.endswith(b"c\r\nprint_from_foo\r\n")
 
-        # set_debug should not raise outcomes.Exit, if used recrursively.
+        # set_debug should not raise outcomes. Exit, if used recursively.
         child.sendline("debug 42")
         child.sendline("q")
         child.expect("LEAVING RECURSIVE DEBUGGER")
diff --git a/testing/test_stepwise.py b/testing/test_stepwise.py
index f61425b6b5b..032351e7f17 100644
--- a/testing/test_stepwise.py
+++ b/testing/test_stepwise.py
@@ -4,7 +4,7 @@
 @pytest.fixture
 def stepwise_testdir(testdir):
     # Rather than having to modify our testfile between tests, we introduce
-    # a flag for wether or not the second test should fail.
+    # a flag for whether or not the second test should fail.
     testdir.makeconftest(
         """
 def pytest_addoption(parser):