diff --git a/HISTORY.rst b/HISTORY.rst
index 5e2c74a..be58f1b 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -1,9 +1,12 @@
 Changelog
 =========
 
-1.3.2 - Unreleased
+1.4.0 - Unreleased
 ------------------
 
+* Add ``-g/--group`` option to ``configure`` command to configure all instances
+  in a group.
+  [fschulze]
 
 
 1.3.1 - 2015-09-03
diff --git a/README.rst b/README.rst
index ffd9ab2..604b807 100644
--- a/README.rst
+++ b/README.rst
@@ -26,6 +26,7 @@ The plugin adds the following commands to ploy.
   Applying the roles given by the ``roles`` option of an instance, a playbook set by the ``playbook`` option or a playbook with the unique name of the instance found in the ``playbooks-directory``.
   Using ``roles`` or a playbook is mutually exclusive.
   If you specify a playbook and there is also a playbook in the default location, you will get a warning.
+  Alternatively you can specify the ``-g/--group`` option to configure all members of the given group.
 
 ``inventory``
   Lists all known groups and their associated hosts, including regular default groups, such as ``all`` but also implicit, ``ploy_ansible`` groups such as instances of a particular ``master`` (i.e. all ``ez-instances`` of an ``ez-master``) 
diff --git a/ploy_ansible/__init__.py b/ploy_ansible/__init__.py
index 80e266b..919d380 100644
--- a/ploy_ansible/__init__.py
+++ b/ploy_ansible/__init__.py
@@ -648,6 +648,8 @@ def get_completion(self):
         return sorted(instances)
 
     def __call__(self, argv, help):
+        inventory = _get_ansible_inventory(self.ctrl, self.ctrl.config)
+        groups = inventory.groups_list()
         parser = argparse.ArgumentParser(
             prog="%s configure" % self.ctrl.progname,
             description=help)
@@ -669,26 +671,39 @@ def __call__(self, argv, help):
             action="append",
             default=[],
             help="set additional variables as key=value or YAML/JSON")
-        parser.add_argument(
+        group = parser.add_mutually_exclusive_group(required=True)
+        group.add_argument(
+            '-g', '--group',
+            nargs='?',
+            metavar="group",
+            help="Name of an ansible group.",
+            choices=list(groups))
+        group.add_argument(
             "instance",
-            nargs=1,
+            nargs='?',
             metavar="instance",
             help="Name of the instance from the config.",
             choices=self.get_completion())
         args = parser.parse_args(argv)
-        instance = self.ctrl.instances[args.instance[0]]
+        instances = []
+        if args.instance is not None:
+            instances.append(self.ctrl.instances[args.instance])
+        else:
+            for name in groups[args.group]:
+                instances.append(self.ctrl.instances[name])
         only_tags = args.only_tags.split(",")
         skip_tags = args.skip_tags
         if skip_tags is not None:
             skip_tags = skip_tags.split(",")
         extra_vars = parse_extra_vars(args.extra_vars)
-        instance.hooks.before_ansible_configure(instance)
-        instance.configure(
-            only_tags=only_tags,
-            skip_tags=skip_tags,
-            extra_vars=extra_vars,
-            verbosity=args.verbose)
-        instance.hooks.after_ansible_configure(instance)
+        for instance in instances:
+            instance.hooks.before_ansible_configure(instance)
+            instance.configure(
+                only_tags=only_tags,
+                skip_tags=skip_tags,
+                extra_vars=extra_vars,
+                verbosity=args.verbose)
+            instance.hooks.after_ansible_configure(instance)
 
 
 class AnsibleInventoryCmd(object):
diff --git a/ploy_ansible/test_ansible.py b/ploy_ansible/test_ansible.py
index f107bb4..4c5b98f 100644
--- a/ploy_ansible/test_ansible.py
+++ b/ploy_ansible/test_ansible.py
@@ -16,7 +16,7 @@ def test_configure_without_args(ctrl):
             ctrl(['./bin/ploy', 'configure'])
     output = "".join(x[0][0] for x in StdErrMock.write.call_args_list)
     assert 'usage: ploy configure' in output
-    assert 'too few arguments' in output
+    assert 'one of the arguments -g/--group instance is required' in output
 
 
 def test_configure_with_nonexisting_instance(ctrl):
@@ -159,6 +159,25 @@ def test_configure_with_extra_vars(ctrl, monkeypatch, tempdir):
     assert runmock.call_args[0][0].extra_vars == dict(foo='bar', bar='foo')
 
 
+def test_configure_group(ctrl, monkeypatch, ployconf, tempdir):
+    import ansible.playbook
+    ployconf.fill([
+        '[dummy-instance:bar]',
+        '[dummy-instance:foo]'])
+    tempdir['default-foo.yml'].fill([
+        '---',
+        '- hosts: default-foo'])
+    tempdir['default-bar.yml'].fill([
+        '---',
+        '- hosts: default-bar'])
+    with patch.object(ansible.playbook.PlayBook, "run", autospec=True) as runmock:
+        ctrl(['./bin/ploy', 'configure', '-g', 'all'])
+    assert runmock.called
+    hosts = [x[0][0].playbook[0]['hosts'] for x in runmock.call_args_list]
+    assert [len(x) for x in hosts] == [1, 1]
+    assert sorted([x[0] for x in hosts]) == ['default-bar', 'default-foo']
+
+
 def test_playbook_without_args(ctrl):
     with patch('sys.stderr') as StdErrMock:
         StdErrMock.encoding = 'utf-8'
diff --git a/setup.py b/setup.py
index fe33567..fd28c76 100644
--- a/setup.py
+++ b/setup.py
@@ -7,7 +7,7 @@
 HISTORY = open(os.path.join(here, 'HISTORY.rst')).read()
 
 
-version = "1.3.2.dev0"
+version = "1.4.0.dev0"
 
 
 install_requires = [