diff --git a/client/package.json b/client/package.json
index ab8cc9333..f5e9891a7 100644
--- a/client/package.json
+++ b/client/package.json
@@ -97,7 +97,7 @@
         "karma-jasmine": "~3.1.1",
         "karma-jasmine-html-reporter": "^1.4.0",
         "npm-license-crawler": "^0.2.1",
-        "prettier": "^2.0.2",
+        "prettier": "^2.0.5",
         "protractor": "^5.4.3",
         "resize-observer-polyfill": "^1.5.1",
         "ts-node": "~8.8.1",
diff --git a/client/src/app/core/repositories/agenda/list-of-speakers-repository.service.ts b/client/src/app/core/repositories/agenda/list-of-speakers-repository.service.ts
index 377ae5796..942ee9ae7 100644
--- a/client/src/app/core/repositories/agenda/list-of-speakers-repository.service.ts
+++ b/client/src/app/core/repositories/agenda/list-of-speakers-repository.service.ts
@@ -220,6 +220,10 @@ export class ListOfSpeakersRepositoryService extends BaseHasContentObjectReposit
         await this.httpService.put(restUrl, { speaker: speaker.id });
     }
 
+    public async deleteAllSpeakersOfAllListsOfSpeakers(): Promise<void> {
+        await this.httpService.post('/rest/agenda/list-of-speakers/delete_all_speakers/');
+    }
+
     /**
      * Helper function get the url to the speaker rest address
      *
diff --git a/client/src/app/site/agenda/components/agenda-list/agenda-list.component.html b/client/src/app/site/agenda/components/agenda-list/agenda-list.component.html
index c72f8c61f..d6a7d2e0b 100644
--- a/client/src/app/site/agenda/components/agenda-list/agenda-list.component.html
+++ b/client/src/app/site/agenda/components/agenda-list/agenda-list.component.html
@@ -121,6 +121,11 @@
             <span>{{ 'Import' | translate }}</span>
         </button>
         <mat-divider></mat-divider>
+        <button mat-menu-item *osPerms="'agenda.can_manage'" class="red-warning-text" (click)="deleteAllSpeakersOfAllListsOfSpeakers()">
+            <mat-icon>delete</mat-icon>
+            <span>{{ 'Delete all speakers' | translate }}</span>
+        </button>
+        <mat-divider></mat-divider>
         <!-- Settings -->
         <button mat-menu-item *osPerms="'core.can_manage_config'" routerLink="/settings/agenda">
             <mat-icon>settings</mat-icon>
diff --git a/client/src/app/site/agenda/components/agenda-list/agenda-list.component.ts b/client/src/app/site/agenda/components/agenda-list/agenda-list.component.ts
index 0b95bd627..2a1bbab15 100644
--- a/client/src/app/site/agenda/components/agenda-list/agenda-list.component.ts
+++ b/client/src/app/site/agenda/components/agenda-list/agenda-list.component.ts
@@ -342,4 +342,12 @@ export class AgendaListComponent extends BaseListViewComponent<ViewItem> impleme
             return result;
         }
     }
+
+    public async deleteAllSpeakersOfAllListsOfSpeakers(): Promise<void> {
+        const title = this.translate.instant('Are you sure you want to clear all speakers of all lists of speakers?');
+        const content = this.translate.instant('All lists of speakers will be cleared and are empty afterwards.');
+        if (await this.promptService.open(title, content)) {
+            this.listOfSpeakersRepo.deleteAllSpeakersOfAllListsOfSpeakers().catch(this.raiseError);
+        }
+    }
 }
diff --git a/openslides/agenda/views.py b/openslides/agenda/views.py
index 9d60f3c70..017415d9b 100644
--- a/openslides/agenda/views.py
+++ b/openslides/agenda/views.py
@@ -296,6 +296,7 @@ class ListOfSpeakersViewSet(
             "speak",
             "sort_speakers",
             "readd_last_speaker",
+            "delete_all_speakers",
         ):
             result = has_perm(
                 self.request.user, "agenda.can_see_list_of_speakers"
@@ -554,3 +555,9 @@ class ListOfSpeakersViewSet(
         last_speaker.save()
 
         return Response()
+
+    @list_route(methods=["post"])
+    def delete_all_speakers(self, request):
+        Speaker.objects.all().delete()
+        inform_changed_data(ListOfSpeakers.objects.all())
+        return Response()