diff --git a/CHANGELOG.md b/CHANGELOG.md
index c10a33f..c3e5076 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## Upcoming
+
+* Add `TimeZoneMixin` for custom `User` models.
+
 ## v14.0.0
 
 * Clarify error message when your old and new passwords match, you will need to update translations.
diff --git a/manage.py b/manage.py
new file mode 100755
index 0000000..0eae09c
--- /dev/null
+++ b/manage.py
@@ -0,0 +1,10 @@
+#!/usr/bin/env python
+import os
+import sys
+
+if __name__ == "__main__":
+    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "user_management.tests.settings")
+
+    from django.core.management import execute_from_command_line
+
+    execute_from_command_line(sys.argv)
diff --git a/requirements.txt b/requirements.txt
index 8771cdb..8545813 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ coverage==3.7.1
 dj-database-url==0.3.0
 dj-inmemorystorage==1.3.0
 factory_boy==2.5.2
-flake8==2.3.0
+flake8==2.5.0
 flake8-import-order==0.5.1
 incuna-test-utils==6.0.0
 mkdocs==0.11.1
diff --git a/user_management/models/mixins.py b/user_management/models/mixins.py
index bd3dd90..1725336 100644
--- a/user_management/models/mixins.py
+++ b/user_management/models/mixins.py
@@ -1,3 +1,4 @@
+import pytz
 from django.contrib.auth.models import BaseUserManager
 from django.contrib.auth.tokens import default_token_generator
 from django.contrib.sites.models import Site
@@ -9,6 +10,7 @@
 from django.utils.translation import ugettext_lazy as _
 
 from user_management.utils import notifications
+from .utils import timezone_choices
 
 
 class UserManager(BaseUserManager):
@@ -55,6 +57,16 @@ class Meta:
         abstract = True
 
 
+class TimeZoneMixin(models.Model):
+    timezone = models.CharField(
+        max_length=255,
+        choices=timezone_choices(pytz.common_timezones),
+    )
+
+    class Meta:
+        abstract = True
+
+
 class EmailUserMixin(models.Model):
     email = models.EmailField(
         verbose_name=_('Email address'),
diff --git a/user_management/models/tests/models.py b/user_management/models/tests/models.py
index 1bb2221..24f1f7c 100644
--- a/user_management/models/tests/models.py
+++ b/user_management/models/tests/models.py
@@ -11,20 +11,23 @@
     EmailVerifyUserMixin,
     IsStaffUserMixin,
     NameUserMethodsMixin,
+    TimeZoneMixin,
     VerifyEmailMixin,
 )
 
 
-class User(AvatarMixin, VerifyEmailMixin, PermissionsMixin, AbstractBaseUser):
-    pass
+class User(
+        AvatarMixin, TimeZoneMixin, VerifyEmailMixin, PermissionsMixin,
+        AbstractBaseUser):
+    """A User model using all the custom mixins."""
 
 
 class BasicUser(BasicUserFieldsMixin, AbstractBaseUser):
-    pass
+    """A User model using just the BasicUserFieldsMixin."""
 
 
 class VerifyEmailUser(VerifyEmailMixin, AbstractBaseUser):
-    pass
+    """A User model using just the VerifyEmailMixin."""
 
 
 class CustomVerifyEmailUser(VerifyEmailMixin, AbstractBaseUser):
@@ -35,6 +38,12 @@ class CustomVerifyEmailUser(VerifyEmailMixin, AbstractBaseUser):
 class CustomBasicUserFieldsMixin(
         NameUserMethodsMixin, EmailUserMixin, DateJoinedUserMixin,
         IsStaffUserMixin):
+    """
+    A replacement for BasicUserFieldsMixin with a custom name field.
+
+    Uses NameUserMethodsMixin instead of NameUserMixin.
+    """
+
     name = models.TextField()
 
     USERNAME_FIELD = 'email'
@@ -46,4 +55,4 @@ class Meta:
 class CustomNameUser(
         AvatarMixin, EmailVerifyUserMixin, CustomBasicUserFieldsMixin,
         AbstractBaseUser):
-    pass
+    """A User model using the CustomBasicUserFieldsMixin."""
diff --git a/user_management/models/tests/test_models.py b/user_management/models/tests/test_models.py
index 23d6b2f..cecd9d1 100644
--- a/user_management/models/tests/test_models.py
+++ b/user_management/models/tests/test_models.py
@@ -48,6 +48,7 @@ def test_fields(self):
             'last_login',
             'password',
             'avatar',
+            'timezone',
 
             # Incoming
             'groups',  # Django permission groups
diff --git a/user_management/models/tests/test_utils.py b/user_management/models/tests/test_utils.py
new file mode 100644
index 0000000..03b7ad8
--- /dev/null
+++ b/user_management/models/tests/test_utils.py
@@ -0,0 +1,53 @@
+from unittest import TestCase
+
+from ..utils import timezone_choices
+
+
+class TestTimeZoneChoices(TestCase):
+    timezones = [
+        'Arctic/Longyearbyen',
+        'Asia/Qyzylorda',
+        'America/Argentina/Ushuaia',
+        'America/Iqaluit',
+        'GMT',
+        'Indian/Christmas',
+        'UTC',
+    ]
+
+    def setUp(self):
+        self.choices = timezone_choices(self.timezones)
+
+    def test_exclude_GMT_UTC(self):
+        self.assertNotIn('GMT', self.choices)
+        self.assertNotIn('UTC', self.choices)
+
+    def test_choice_groups(self):
+        expected_choices = (
+            (
+                'Arctic',
+                (
+                    ('Arctic/Longyearbyen', 'Longyearbyen'),
+                ),
+            ),
+            (
+                'Asia',
+                (
+                    ('Asia/Qyzylorda', 'Qyzylorda'),
+                ),
+            ),
+            (
+                'America',
+                (
+                    ('America/Argentina/Ushuaia', 'Argentina/Ushuaia'),
+                    ('America/Iqaluit', 'Iqaluit'),
+                ),
+            ),
+            (
+                'Indian',
+                (
+                    ('Indian/Christmas', 'Christmas'),
+                ),
+            ),
+        )
+
+        self.assertEqual(self.choices, expected_choices)
diff --git a/user_management/models/utils.py b/user_management/models/utils.py
new file mode 100644
index 0000000..6fb0b76
--- /dev/null
+++ b/user_management/models/utils.py
@@ -0,0 +1,20 @@
+from collections import defaultdict, OrderedDict
+
+
+class DefaultOrderedDict(OrderedDict, defaultdict):
+    def __init__(self, default_factory=None, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.default_factory = default_factory
+
+
+def timezone_choices(timezones, exclude=('GMT', 'UTC')):
+    choices = DefaultOrderedDict(list)
+
+    for timezone in timezones:
+        if timezone in exclude:
+            continue
+
+        continent, _sep, town = timezone.partition('/')
+        choices[continent].append((timezone, town))
+
+    return tuple((c, tuple(t)) for c, t in choices.items())
diff --git a/user_management/tests/settings.py b/user_management/tests/settings.py
new file mode 100644
index 0000000..4d12821
--- /dev/null
+++ b/user_management/tests/settings.py
@@ -0,0 +1,35 @@
+SECRET_KEY = 'not-for-production'
+DEBUG = True
+
+ALLOWED_HOSTS = []
+
+INSTALLED_APPS = (
+    # Put contenttypes before auth to work around test issue.
+    # See: https://code.djangoproject.com/ticket/10827#comment:12
+    'django.contrib.sites',
+    'django.contrib.contenttypes',
+    'django.contrib.auth',
+    'django.contrib.sessions',
+    'django.contrib.admin',
+
+    'rest_framework.authtoken',
+
+    # Added for templates
+    'user_management.api',
+    'user_management.models.tests',
+)
+
+AUTH_USER_MODEL = 'tests.User'
+
+MIDDLEWARE_CLASSES = ()
+
+LANGUAGE_CODE = 'en-us'
+TIME_ZONE = 'UTC'
+USE_I18N = True
+USE_L10N = True
+USE_TZ = True
+
+MIGRATION_MODULES = {
+    'api': 'user_management.tests.testmigrations.api',
+    'tests': 'user_management.tests.testmigrations.tests',
+}
diff --git a/user_management/tests/testmigrations/tests/0002_user_timezone.py b/user_management/tests/testmigrations/tests/0002_user_timezone.py
new file mode 100644
index 0000000..4a7168e
--- /dev/null
+++ b/user_management/tests/testmigrations/tests/0002_user_timezone.py
@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('tests', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='user',
+            name='timezone',
+            field=models.CharField(default='UTC', max_length=255),
+        ),
+    ]
diff --git a/user_management/tests/testmigrations/tests/0003_user_timezone_choices.py b/user_management/tests/testmigrations/tests/0003_user_timezone_choices.py
new file mode 100644
index 0000000..a835076
--- /dev/null
+++ b/user_management/tests/testmigrations/tests/0003_user_timezone_choices.py
@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+import pytz
+from django.db import migrations, models
+from user_management.models.utils import timezone_choices
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('tests', '0002_user_timezone'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='user',
+            name='timezone',
+            field=models.CharField(choices=timezone_choices(pytz.common_timezones), max_length=255),
+        ),
+    ]