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diff --git a/src/mailman/interfaces/listmanager.py b/src/mailman/interfaces/listmanager.py
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+++ b/src/mailman/interfaces/listmanager.py
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+# Copyright (C) 2007-2009 by the Free Software Foundation, Inc.
+#
+# This file is part of GNU Mailman.
+#
+# GNU Mailman is free software: you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option)
+# any later version.
+#
+# GNU Mailman is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# GNU Mailman.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Interface for list storage, deleting, and finding."""
+
+from __future__ import absolute_import, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+    'IListManager',
+    'ListAlreadyExistsError',
+    ]
+
+
+from zope.interface import Interface, Attribute
+from mailman.interfaces.errors import MailmanError
+
+
+
+class ListAlreadyExistsError(MailmanError):
+    """Attempted to create a mailing list that already exists.
+
+    Mailing list objects must be uniquely named by their fully qualified list
+    name.
+    """
+
+
+
+class IListManager(Interface):
+    """The interface of the global list manager.
+
+    The list manager manages `IMailingList` objects.  You can add and remove
+    `IMailingList` objects from the list manager, and you can retrieve them
+    from the manager via their fully qualified list name, e.g.:
+    `mylist@example.com`.
+    """
+
+    def create(fqdn_listname):
+        """Create a mailing list with the given name.
+
+        :type fqdn_listname: Unicode
+        :param fqdn_listname: The fully qualified name of the mailing list,
+            e.g. `mylist@example.com`.
+        :return: The newly created `IMailingList`.
+        :raise `ListAlreadyExistsError` if the named list already exists.
+        """
+
+    def get(fqdn_listname):
+        """Return the mailing list with the given name, if it exists.
+
+        :type fqdn_listname: Unicode.
+        :param fqdn_listname: The fully qualified name of the mailing list.
+        :return: the matching `IMailingList` or None if the named list does
+            not exist.
+        """
+
+    def delete(mlist):
+        """Remove the mailing list from the database.
+
+        :type mlist: `IMailingList`
+        :param mlist: The mailing list to delete.
+        """
+
+    mailing_lists = Attribute(
+        """An iterator over all the mailing list objects managed by this list
+        manager.""")
+
+    names = Attribute(
+        """An iterator over the fully qualified list names of all mailing
+        lists managed by this list manager.""")