diff --git a/AUTHORS b/AUTHORS
index 4f9cd850b..7e03b37ed 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -9,6 +9,7 @@ Contributors
 
 Abhishek Patel
 Alessandro De Angelis
+Aleksander Vaskevich
 Alan Crosswell
 Anvesh Agarwal
 Asif Saif Uddin
diff --git a/CHANGELOG.md b/CHANGELOG.md
index b10ebfe30..1cb02280a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-<!-- 
+<!--
 ## [unreleased]
 ### Added
 ### Changed
@@ -16,6 +16,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [unreleased]
 
+* #898 Added the ability to customize classes for django admin
+
 ### Added
 * #884 Added support for Python 3.9
 
diff --git a/docs/settings.rst b/docs/settings.rst
index eb7324672..911edb255 100644
--- a/docs/settings.rst
+++ b/docs/settings.rst
@@ -97,6 +97,30 @@ The import string of the class (model) representing your grants. Overwrite
 this value if you wrote your own implementation (subclass of
 ``oauth2_provider.models.Grant``).
 
+APPLICATION_ADMIN_CLASS
+~~~~~~~~~~~~~~~~~
+The import string of the class (model) representing your application admin class.
+Overwrite this value if you wrote your own implementation (subclass of
+``oauth2_provider.admin.ApplicationAdmin``).
+
+ACCESS_TOKEN_ADMIN_CLASS
+~~~~~~~~~~~~~~~~~
+The import string of the class (model) representing your access token admin class.
+Overwrite this value if you wrote your own implementation (subclass of
+``oauth2_provider.admin.AccessTokenAdmin``).
+
+GRANT_ADMIN_CLASS
+~~~~~~~~~~~~~~~~~
+The import string of the class (model) representing your grant admin class.
+Overwrite this value if you wrote your own implementation (subclass of
+``oauth2_provider.admin.GrantAdmin``).
+
+REFRESH_TOKEN_ADMIN_CLASS
+~~~~~~~~~~~~~~~~~
+The import string of the class (model) representing your refresh token admin class.
+Overwrite this value if you wrote your own implementation (subclass of
+``oauth2_provider.admin.RefreshTokenAdmin``).
+
 OAUTH2_SERVER_CLASS
 ~~~~~~~~~~~~~~~~~~~
 The import string for the ``server_class`` (or ``oauthlib.oauth2.Server`` subclass)
diff --git a/oauth2_provider/admin.py b/oauth2_provider/admin.py
index a2ec8501a..ed835cd16 100644
--- a/oauth2_provider/admin.py
+++ b/oauth2_provider/admin.py
@@ -1,6 +1,15 @@
 from django.contrib import admin
 
-from .models import get_access_token_model, get_application_model, get_grant_model, get_refresh_token_model
+from oauth2_provider.models import (
+    get_access_token_admin_class,
+    get_access_token_model,
+    get_application_admin_class,
+    get_application_model,
+    get_grant_admin_class,
+    get_grant_model,
+    get_refresh_token_admin_class,
+    get_refresh_token_model,
+)
 
 
 class ApplicationAdmin(admin.ModelAdmin):
@@ -13,27 +22,32 @@ class ApplicationAdmin(admin.ModelAdmin):
     raw_id_fields = ("user",)
 
 
-class GrantAdmin(admin.ModelAdmin):
-    list_display = ("code", "application", "user", "expires")
-    raw_id_fields = ("user",)
-
-
 class AccessTokenAdmin(admin.ModelAdmin):
     list_display = ("token", "user", "application", "expires")
     raw_id_fields = ("user", "source_refresh_token")
 
 
+class GrantAdmin(admin.ModelAdmin):
+    list_display = ("code", "application", "user", "expires")
+    raw_id_fields = ("user",)
+
+
 class RefreshTokenAdmin(admin.ModelAdmin):
     list_display = ("token", "user", "application")
     raw_id_fields = ("user", "access_token")
 
 
-Application = get_application_model()
-Grant = get_grant_model()
-AccessToken = get_access_token_model()
-RefreshToken = get_refresh_token_model()
+application_model = get_application_model()
+access_token_model = get_access_token_model()
+grant_model = get_grant_model()
+refresh_token_model = get_refresh_token_model()
+
+application_admin_class = get_application_admin_class()
+access_token_admin_class = get_access_token_admin_class()
+grant_admin_class = get_grant_admin_class()
+refresh_token_admin_class = get_refresh_token_admin_class()
 
-admin.site.register(Application, ApplicationAdmin)
-admin.site.register(Grant, GrantAdmin)
-admin.site.register(AccessToken, AccessTokenAdmin)
-admin.site.register(RefreshToken, RefreshTokenAdmin)
+admin.site.register(application_model, application_admin_class)
+admin.site.register(access_token_model, access_token_admin_class)
+admin.site.register(grant_model, grant_admin_class)
+admin.site.register(refresh_token_model, refresh_token_admin_class)
diff --git a/oauth2_provider/models.py b/oauth2_provider/models.py
index 77542d35f..23c16bdf6 100644
--- a/oauth2_provider/models.py
+++ b/oauth2_provider/models.py
@@ -453,6 +453,30 @@ def get_refresh_token_model():
     return apps.get_model(oauth2_settings.REFRESH_TOKEN_MODEL)
 
 
+def get_application_admin_class():
+    """ Return the Application admin class that is active in this project. """
+    application_admin_class = oauth2_settings.APPLICATION_ADMIN_CLASS
+    return application_admin_class
+
+
+def get_access_token_admin_class():
+    """ Return the AccessToken admin class that is active in this project. """
+    access_token_admin_class = oauth2_settings.ACCESS_TOKEN_ADMIN_CLASS
+    return access_token_admin_class
+
+
+def get_grant_admin_class():
+    """ Return the Grant admin class that is active in this project. """
+    grant_admin_class = oauth2_settings.GRANT_ADMIN_CLASS
+    return grant_admin_class
+
+
+def get_refresh_token_admin_class():
+    """ Return the RefreshToken admin class that is active in this project. """
+    refresh_token_admin_class = oauth2_settings.REFRESH_TOKEN_ADMIN_CLASS
+    return refresh_token_admin_class
+
+
 def clear_expired():
     now = timezone.now()
     refresh_expire_at = None
diff --git a/oauth2_provider/settings.py b/oauth2_provider/settings.py
index 42c08b676..5d81a05ef 100644
--- a/oauth2_provider/settings.py
+++ b/oauth2_provider/settings.py
@@ -15,10 +15,11 @@
 OAuth2 Provider settings, checking for user settings first, then falling
 back to the defaults.
 """
-import importlib
 
 from django.conf import settings
 from django.core.exceptions import ImproperlyConfigured
+from django.test.signals import setting_changed
+from django.utils.module_loading import import_string
 
 
 USER_SETTINGS = getattr(settings, "OAUTH2_PROVIDER", None)
@@ -53,6 +54,10 @@
     "ACCESS_TOKEN_MODEL": ACCESS_TOKEN_MODEL,
     "GRANT_MODEL": GRANT_MODEL,
     "REFRESH_TOKEN_MODEL": REFRESH_TOKEN_MODEL,
+    "APPLICATION_ADMIN_CLASS": "oauth2_provider.admin.ApplicationAdmin",
+    "ACCESS_TOKEN_ADMIN_CLASS": "oauth2_provider.admin.AccessTokenAdmin",
+    "GRANT_ADMIN_CLASS": "oauth2_provider.admin.GrantAdmin",
+    "REFRESH_TOKEN_ADMIN_CLASS": "oauth2_provider.admin.RefreshTokenAdmin",
     "REQUEST_APPROVAL_PROMPT": "force",
     "ALLOWED_REDIRECT_URI_SCHEMES": ["http", "https"],
     # Special settings that will be evaluated at runtime
@@ -88,6 +93,10 @@
     "OAUTH2_VALIDATOR_CLASS",
     "OAUTH2_BACKEND_CLASS",
     "SCOPES_BACKEND_CLASS",
+    "APPLICATION_ADMIN_CLASS",
+    "ACCESS_TOKEN_ADMIN_CLASS",
+    "GRANT_ADMIN_CLASS",
+    "REFRESH_TOKEN_ADMIN_CLASS",
 )
 
 
@@ -96,12 +105,13 @@ def perform_import(val, setting_name):
     If the given setting is a string import notation,
     then perform the necessary import or imports.
     """
-    if isinstance(val, (list, tuple)):
-        return [import_from_string(item, setting_name) for item in val]
-    elif "." in val:
+    if val is None:
+        return None
+    elif isinstance(val, str):
         return import_from_string(val, setting_name)
-    else:
-        raise ImproperlyConfigured("Bad value for %r: %r" % (setting_name, val))
+    elif isinstance(val, (list, tuple)):
+        return [import_from_string(item, setting_name) for item in val]
+    return val
 
 
 def import_from_string(val, setting_name):
@@ -109,10 +119,7 @@ def import_from_string(val, setting_name):
     Attempt to import a class from a string representation.
     """
     try:
-        parts = val.split(".")
-        module_path, class_name = ".".join(parts[:-1]), parts[-1]
-        module = importlib.import_module(module_path)
-        return getattr(module, class_name)
+        return import_string(val)
     except ImportError as e:
         msg = "Could not import %r for setting %r. %s: %s." % (val, setting_name, e.__class__.__name__, e)
         raise ImportError(msg)
@@ -127,14 +134,21 @@ class OAuth2ProviderSettings:
     """
 
     def __init__(self, user_settings=None, defaults=None, import_strings=None, mandatory=None):
-        self.user_settings = user_settings or {}
-        self.defaults = defaults or {}
-        self.import_strings = import_strings or ()
+        self._user_settings = user_settings or {}
+        self.defaults = defaults or DEFAULTS
+        self.import_strings = import_strings or IMPORT_STRINGS
         self.mandatory = mandatory or ()
+        self._cached_attrs = set()
+
+    @property
+    def user_settings(self):
+        if not hasattr(self, "_user_settings"):
+            self._user_settings = getattr(settings, "OAUTH2_PROVIDER", {})
+        return self._user_settings
 
     def __getattr__(self, attr):
-        if attr not in self.defaults.keys():
-            raise AttributeError("Invalid OAuth2Provider setting: %r" % (attr))
+        if attr not in self.defaults:
+            raise AttributeError("Invalid OAuth2Provider setting: %s" % attr)
 
         try:
             # Check if present in user settings
@@ -166,12 +180,13 @@ def __getattr__(self, attr):
         self.validate_setting(attr, val)
 
         # Cache the result
+        self._cached_attrs.add(attr)
         setattr(self, attr, val)
         return val
 
     def validate_setting(self, attr, val):
         if not val and attr in self.mandatory:
-            raise AttributeError("OAuth2Provider setting: %r is mandatory" % (attr))
+            raise AttributeError("OAuth2Provider setting: %s is mandatory" % attr)
 
     @property
     def server_kwargs(self):
@@ -199,5 +214,21 @@ def server_kwargs(self):
         kwargs.update(self.EXTRA_SERVER_KWARGS)
         return kwargs
 
+    def reload(self):
+        for attr in self._cached_attrs:
+            delattr(self, attr)
+        self._cached_attrs.clear()
+        if hasattr(self, "_user_settings"):
+            delattr(self, "_user_settings")
+
 
 oauth2_settings = OAuth2ProviderSettings(USER_SETTINGS, DEFAULTS, IMPORT_STRINGS, MANDATORY)
+
+
+def reload_oauth2_settings(*args, **kwargs):
+    setting = kwargs["setting"]
+    if setting == "OAUTH2_PROVIDER":
+        oauth2_settings.reload()
+
+
+setting_changed.connect(reload_oauth2_settings)
diff --git a/tests/admin.py b/tests/admin.py
new file mode 100644
index 000000000..557434250
--- /dev/null
+++ b/tests/admin.py
@@ -0,0 +1,17 @@
+from django.contrib import admin
+
+
+class CustomApplicationAdmin(admin.ModelAdmin):
+    list_display = ("id",)
+
+
+class CustomAccessTokenAdmin(admin.ModelAdmin):
+    list_display = ("id",)
+
+
+class CustomGrantAdmin(admin.ModelAdmin):
+    list_display = ("id",)
+
+
+class CustomRefreshTokenAdmin(admin.ModelAdmin):
+    list_display = ("id",)
diff --git a/tests/test_settings.py b/tests/test_settings.py
new file mode 100644
index 000000000..379d12c2e
--- /dev/null
+++ b/tests/test_settings.py
@@ -0,0 +1,90 @@
+from django.test import TestCase
+from django.test.utils import override_settings
+
+from oauth2_provider.admin import (
+    get_access_token_admin_class,
+    get_application_admin_class,
+    get_grant_admin_class,
+    get_refresh_token_admin_class,
+)
+from oauth2_provider.settings import OAuth2ProviderSettings, oauth2_settings
+from tests.admin import (
+    CustomAccessTokenAdmin,
+    CustomApplicationAdmin,
+    CustomGrantAdmin,
+    CustomRefreshTokenAdmin,
+)
+
+
+class TestAdminClass(TestCase):
+    def test_import_error_message_maintained(self):
+        """
+        Make sure import errors are captured and raised sensibly.
+        """
+        settings = OAuth2ProviderSettings({"CLIENT_ID_GENERATOR_CLASS": "invalid_module.InvalidClassName"})
+        with self.assertRaises(ImportError):
+            settings.CLIENT_ID_GENERATOR_CLASS
+
+    def test_get_application_admin_class(self):
+        """
+        Test for getting class for application admin.
+        """
+        application_admin_class = get_application_admin_class()
+        default_application_admin_class = oauth2_settings.APPLICATION_ADMIN_CLASS
+        assert application_admin_class == default_application_admin_class
+
+    def test_get_access_token_admin_class(self):
+        """
+        Test for getting class for access token admin.
+        """
+        access_token_admin_class = get_access_token_admin_class()
+        default_access_token_admin_class = oauth2_settings.ACCESS_TOKEN_ADMIN_CLASS
+        assert access_token_admin_class == default_access_token_admin_class
+
+    def test_get_grant_admin_class(self):
+        """
+        Test for getting class for grant admin.
+        """
+        grant_admin_class = get_grant_admin_class()
+        default_grant_admin_class = oauth2_settings.GRANT_ADMIN_CLASS
+        assert grant_admin_class, default_grant_admin_class
+
+    def test_get_refresh_token_admin_class(self):
+        """
+        Test for getting class for refresh token admin.
+        """
+        refresh_token_admin_class = get_refresh_token_admin_class()
+        default_refresh_token_admin_class = oauth2_settings.REFRESH_TOKEN_ADMIN_CLASS
+        assert refresh_token_admin_class == default_refresh_token_admin_class
+
+    @override_settings(OAUTH2_PROVIDER={"APPLICATION_ADMIN_CLASS": "tests.admin.CustomApplicationAdmin"})
+    def test_get_custom_application_admin_class(self):
+        """
+        Test for getting custom class for application admin.
+        """
+        application_admin_class = get_application_admin_class()
+        assert application_admin_class == CustomApplicationAdmin
+
+    @override_settings(OAUTH2_PROVIDER={"ACCESS_TOKEN_ADMIN_CLASS": "tests.admin.CustomAccessTokenAdmin"})
+    def test_get_custom_access_token_admin_class(self):
+        """
+        Test for getting custom class for access token admin.
+        """
+        access_token_admin_class = get_access_token_admin_class()
+        assert access_token_admin_class == CustomAccessTokenAdmin
+
+    @override_settings(OAUTH2_PROVIDER={"GRANT_ADMIN_CLASS": "tests.admin.CustomGrantAdmin"})
+    def test_get_custom_grant_admin_class(self):
+        """
+        Test for getting custom class for grant admin.
+        """
+        grant_admin_class = get_grant_admin_class()
+        assert grant_admin_class == CustomGrantAdmin
+
+    @override_settings(OAUTH2_PROVIDER={"REFRESH_TOKEN_ADMIN_CLASS": "tests.admin.CustomRefreshTokenAdmin"})
+    def test_get_custom_refresh_token_admin_class(self):
+        """
+        Test for getting custom class for refresh token admin.
+        """
+        refresh_token_admin_class = get_refresh_token_admin_class()
+        assert refresh_token_admin_class == CustomRefreshTokenAdmin