diff --git a/.github/workflows/md5_check_initial-data.yml b/.github/workflows/md5_check_initial-data.yml
index 9c4644850..4fcc9e523 100644
--- a/.github/workflows/md5_check_initial-data.yml
+++ b/.github/workflows/md5_check_initial-data.yml
@@ -21,4 +21,4 @@ jobs:
         run: md5sum docker/initial-data.json
 
       - name: Validate and protect initial-data.json
-        run: echo "6516e4a8d29c623d301c0c463e3d1db5  docker/initial-data.json" | md5sum -c -
+        run: echo "eb70fc8581fc011b5da4b022068564b9  docker/initial-data.json" | md5sum -c -
diff --git a/docker/initial-data.json b/docker/initial-data.json
index f528ab87c..98ffe860a 100644
--- a/docker/initial-data.json
+++ b/docker/initial-data.json
@@ -8,7 +8,6 @@
             "legal_notice": "<a href=\"http://www.openslides.org\">OpenSlides</a> is a free web based presentation and assembly system for visualizing and controlling agenda, motions and elections of an assembly. The event organizer is resposible for the content.",
             "privacy_policy": "",
             "login_text": "Welcome to OpenSlides. Please login.",
-            "theme": "openslides-default-light-theme",
             "reset_password_verbose_errors": false,
             "enable_electronic_voting": false,
             "limit_of_meetings": 0,
@@ -19,7 +18,9 @@
                 1
             ],
             "resource_ids": [],
-            "organization_tag_ids": []
+            "organization_tag_ids": [],
+            "theme_id": 1,
+            "theme_ids": [1]
         }
     },
     "user": {
@@ -68,6 +69,56 @@
     },
     "resource": {},
     "organization_tag": {},
+    "theme": {
+        "1":{
+            "id": 1,
+            "name": "OpenSlides Blue",
+            "accent_500": "#2196f3",
+            "primary_500": "#317796",
+            "warn_500": "#f06400",
+            "organization_id": 1,
+            "theme_for_organization_id": 1,
+            "accent_100": null,
+            "accent_200": null,
+            "accent_300": null,
+            "accent_400": null,
+            "accent_50": null,
+            "accent_600": null,
+            "accent_700": null,
+            "accent_800": null,
+            "accent_900": null,
+            "accent_a100": null,
+            "accent_a200": null,
+            "accent_a400": null,
+            "accent_a700": null,
+            "primary_100": null,
+            "primary_200": null,
+            "primary_300": null,
+            "primary_400": null,
+            "primary_50": null,
+            "primary_600": null,
+            "primary_700": null,
+            "primary_800": null,
+            "primary_900": null,
+            "primary_a100": null,
+            "primary_a200": null,
+            "primary_a400": null,
+            "primary_a700": null,
+            "warn_100": null,
+            "warn_200": null,
+            "warn_300": null,
+            "warn_400": null,
+            "warn_50": null,
+            "warn_600": null,
+            "warn_700": null,
+            "warn_800": null,
+            "warn_900": null,
+            "warn_a100": null,
+            "warn_a200": null,
+            "warn_a400": null,
+            "warn_a700": null
+        }
+    },
     "committee": {
         "1": {
             "id": 1,
diff --git a/docs/example-data.json b/docs/example-data.json
index 071fe4a97..502bb766e 100644
--- a/docs/example-data.json
+++ b/docs/example-data.json
@@ -8,7 +8,6 @@
             "legal_notice": "<a href=\"http://www.openslides.org\">OpenSlides</a> is a free web based presentation and assembly system for visualizing and controlling agenda, motions and elections of an assembly.",
             "privacy_policy": "",
             "login_text": "Guten Morgen!",
-            "theme": "openslides-theme",
             "enable_electronic_voting": true,
             "reset_password_verbose_errors": true,
             "committee_ids": [
@@ -23,7 +22,9 @@
             ],
             "organization_tag_ids": [
                 1
-            ]
+            ],
+            "theme_id": 1,
+            "theme_ids": [1]
         }
     },
     "user": {
@@ -331,6 +332,56 @@
             "organization_id": 1
         }
     },
+    "theme": {
+        "1":{
+            "id": 1,
+            "name": "OpenSlides Blue",
+            "accent_500": "#2196f3",
+            "primary_500": "#317796",
+            "warn_500": "#f06400",
+            "organization_id": 1,
+            "theme_for_organization_id": 1,
+            "accent_100": null,
+            "accent_200": null,
+            "accent_300": null,
+            "accent_400": null,
+            "accent_50": null,
+            "accent_600": null,
+            "accent_700": null,
+            "accent_800": null,
+            "accent_900": null,
+            "accent_a100": null,
+            "accent_a200": null,
+            "accent_a400": null,
+            "accent_a700": null,
+            "primary_100": null,
+            "primary_200": null,
+            "primary_300": null,
+            "primary_400": null,
+            "primary_50": null,
+            "primary_600": null,
+            "primary_700": null,
+            "primary_800": null,
+            "primary_900": null,
+            "primary_a100": null,
+            "primary_a200": null,
+            "primary_a400": null,
+            "primary_a700": null,
+            "warn_100": null,
+            "warn_200": null,
+            "warn_300": null,
+            "warn_400": null,
+            "warn_50": null,
+            "warn_600": null,
+            "warn_700": null,
+            "warn_800": null,
+            "warn_900": null,
+            "warn_a100": null,
+            "warn_a200": null,
+            "warn_a400": null,
+            "warn_a700": null
+        }
+    },
     "organization_tag": {
         "1": {
             "id": 1,
diff --git a/docs/models.yml b/docs/models.yml
index 9c6d16c0b..4cf99f5de 100644
--- a/docs/models.yml
+++ b/docs/models.yml
@@ -86,9 +86,6 @@ organization:
   login_text:
     type: string
     restriction_mode: A
-  theme:
-    type: string
-    restriction_mode: A
   reset_password_verbose_errors:
     type: boolean
     restriction_mode: B
@@ -120,6 +117,15 @@ organization:
     type: relation-list
     restriction_mode: B
     to: organization_tag/organization_id
+  theme_id:
+    type: relation
+    required: true
+    restriction_mode: A
+    to: theme/theme_for_organization_id
+  theme_ids:
+    type: relation-list
+    restriction_mode: A
+    to: theme/organization_id
 
 user:
   id:
@@ -338,7 +344,6 @@ user:
       type: relation-list
       to: user/vote_delegated_$_to_id
     restriction_mode: C
-
   meeting_ids:
     type: number[]
     description: Calculated. All ids from group_$_ids as integers.
@@ -397,6 +402,154 @@ organization_tag:
     restriction_mode: A
     required: true
 
+theme:
+  id:
+    restriction_mode: A
+    type: number
+    required: true
+  name:
+    restriction_mode: A
+    type: string
+    required: true
+  accent_100:
+    restriction_mode: A
+    type: color
+  accent_200:
+    restriction_mode: A
+    type: color
+  accent_300:
+    restriction_mode: A
+    type: color
+  accent_400:
+    restriction_mode: A
+    type: color
+  accent_50:
+    restriction_mode: A
+    type: color
+  accent_500:
+    restriction_mode: A
+    type: color
+    required: true
+  accent_600:
+    restriction_mode: A
+    type: color
+  accent_700:
+    restriction_mode: A
+    type: color
+  accent_800:
+    restriction_mode: A
+    type: color
+  accent_900:
+    restriction_mode: A
+    type: color
+  accent_a100:
+    restriction_mode: A
+    type: color
+  accent_a200:
+    restriction_mode: A
+    type: color
+  accent_a400:
+    restriction_mode: A
+    type: color
+  accent_a700:
+    restriction_mode: A
+    type: color
+  primary_100:
+    restriction_mode: A
+    type: color
+  primary_200:
+    restriction_mode: A
+    type: color
+  primary_300:
+    restriction_mode: A
+    type: color
+  primary_400:
+    restriction_mode: A
+    type: color
+  primary_50:
+    restriction_mode: A
+    type: color
+  primary_500:
+    restriction_mode: A
+    type: color
+    required: true
+  primary_600:
+    restriction_mode: A
+    type: color
+  primary_700:
+    restriction_mode: A
+    type: color
+  primary_800:
+    restriction_mode: A
+    type: color
+  primary_900:
+    restriction_mode: A
+    type: color
+  primary_a100:
+    restriction_mode: A
+    type: color
+  primary_a200:
+    restriction_mode: A
+    type: color
+  primary_a400:
+    restriction_mode: A
+    type: color
+  primary_a700:
+    restriction_mode: A
+    type: color
+  warn_100:
+    restriction_mode: A
+    type: color
+  warn_200:
+    restriction_mode: A
+    type: color
+  warn_300:
+    restriction_mode: A
+    type: color
+  warn_400:
+    restriction_mode: A
+    type: color
+  warn_50:
+    restriction_mode: A
+    type: color
+  warn_500:
+    restriction_mode: A
+    type: color
+    required: true
+  warn_600:
+    restriction_mode: A
+    type: color
+  warn_700:
+    restriction_mode: A
+    type: color
+  warn_800:
+    restriction_mode: A
+    type: color
+  warn_900:
+    restriction_mode: A
+    type: color
+  warn_a100:
+    restriction_mode: A
+    type: color
+  warn_a200:
+    restriction_mode: A
+    type: color
+  warn_a400:
+    restriction_mode: A
+    type: color
+  warn_a700:
+    restriction_mode: A
+    type: color
+  theme_for_organization_id:
+    restriction_mode: A
+    to: organization/theme_id
+    type: relation
+  organization_id:
+    required: true
+    restriction_mode: A
+    to: organization/theme_ids
+    type: relation
+
 committee:
   id:
     type: number