diff --git a/color.py b/color.py
index 7970198..b279928 100644
--- a/color.py
+++ b/color.py
@@ -83,15 +83,38 @@
   return code
 
 
+DEFAULT = None
+
+def SetDefaultColoring(state):
+  """Set coloring behavior to |state|.
+
+  This is useful for overriding config options via the command line.
+  """
+  if state is None:
+    # Leave it alone -- return quick!
+    return
+
+  global DEFAULT
+  state = state.lower()
+  if state in ('auto',):
+    DEFAULT = state
+  elif state in ('always', 'yes', 'true', True):
+    DEFAULT = 'always'
+  elif state in ('never', 'no', 'false', False):
+    DEFAULT = 'never'
+
+
 class Coloring(object):
   def __init__(self, config, section_type):
     self._section = 'color.%s' % section_type
     self._config = config
     self._out = sys.stdout
 
-    on = self._config.GetString(self._section)
+    on = DEFAULT
     if on is None:
-      on = self._config.GetString('color.ui')
+      on = self._config.GetString(self._section)
+      if on is None:
+        on = self._config.GetString('color.ui')
 
     if on == 'auto':
       if pager.active or os.isatty(1):
diff --git a/main.py b/main.py
index 72fb39b..47f083d 100755
--- a/main.py
+++ b/main.py
@@ -36,6 +36,7 @@
 except ImportError:
   kerberos = None
 
+from color import SetDefaultColoring
 from trace import SetTrace
 from git_command import git, GitCommand
 from git_config import init_ssh, close_ssh
@@ -69,6 +70,9 @@
 global_options.add_option('--no-pager',
                           dest='no_pager', action='store_true',
                           help='disable the pager')
+global_options.add_option('--color',
+                          choices=('auto', 'always', 'never'), default=None,
+                          help='control color usage: auto, always, never')
 global_options.add_option('--trace',
                           dest='trace', action='store_true',
                           help='trace git command execution')
@@ -113,6 +117,8 @@
         print('fatal: invalid usage of --version', file=sys.stderr)
         return 1
 
+    SetDefaultColoring(gopts.color)
+
     try:
       cmd = self.commands[name]
     except KeyError: