diff --git a/.travis.yml b/.travis.yml
index 0c2255acc..86c9cbab0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,6 +15,7 @@ install:
   - "node_modules/.bin/gulp --production"
 script:
   - "flake8 --max-line-length=150 --statistics openslides tests"
+  - "isort --check-only --recursive openslides tests"
 
   - "DJANGO_SETTINGS_MODULE='tests.settings' coverage run ./manage.py test tests.unit"
   - "coverage report --show-missing --fail-under=35"
diff --git a/make/commands.py b/make/commands.py
index e21db86da..ec338213c 100644
--- a/make/commands.py
+++ b/make/commands.py
@@ -120,3 +120,9 @@ def po2json(args=None):
     lang = args.language
     call('node_modules/.bin/po2json openslides/locale/%s/javascript.po openslides/static/i18n/%s.json' %
          (lang, lang))
+
+
+@command('isort',
+         help='Sorts all imports in all python files.')
+def isort(args=None):
+    return call('isort --recursive openslides tests')
diff --git a/requirements.txt b/requirements.txt
index bcbf2c270..a776e612a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,8 +2,9 @@
 -r requirements_production.txt
 
 # Requirements for development and tests in alphabetical order
-coverage==3.7.1
-flake8==2.2.4
+coverage
+flake8
+isort
 
 # Requirements for OpenSlides handbook/documentation in alphabetical order
 Sphinx==1.2.2
diff --git a/setup.cfg b/setup.cfg
new file mode 100644
index 000000000..686d1fbb9
--- /dev/null
+++ b/setup.cfg
@@ -0,0 +1,4 @@
+[isort]
+multi_line_output=3
+include_trailing_comma=True
+skip=main.py,signals.py,csv_import.py,global_settings.py,test_personal_info.py,tests.py,auth.py,search_indexes.py,test_list_of_speakers.py,chatbox.py,test_main_menu.py,test_config.py,runserver.py,rest_api.py,settings.py,test_pdf.py,__main__.py,test_serializers.py,autoupdate.py,pdf.py,widgets.py,models.py,test_csv_import.py,plugins.py,serializers.py,test_csv.py,test_overlays.py,backupdb.py,views.py,test_views.py,urls.py,forms.py,utils.py,test_auth.py