diff --git a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.ts b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.ts
index 75854cc..e47b450 100644
--- a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.ts
@@ -1577,10 +1577,11 @@
       base: e.detail.base,
       allow_conflicts: e.detail.allowConflicts,
     };
+    const rebaseChain = !!e.detail.rebaseChain;
     this.fireAction(
-      '/rebase',
+      rebaseChain ? '/rebase:chain' : '/rebase',
       assertUIActionInfo(this.revisionActions.rebase),
-      true,
+      rebaseChain ? false : true,
       payload,
       {allow_conflicts: payload.allow_conflicts}
     );
diff --git a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_test.ts b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_test.ts
index c6bfd55..4602eac 100644
--- a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_test.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_test.ts
@@ -625,7 +625,9 @@
       };
       assert.isTrue(fetchChangesStub.called);
       element.handleRebaseConfirm(
-        new CustomEvent('', {detail: {base: '1234', allowConflicts: false}})
+        new CustomEvent('', {
+          detail: {base: '1234', allowConflicts: false, rebaseChain: false},
+        })
       );
       assert.deepEqual(fireActionStub.lastCall.args, [
         '/rebase',
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog.ts b/polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog.ts
index da61b60..b0dbda5 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog.ts
+++ b/polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog.ts
@@ -5,6 +5,7 @@
  */
 import {css, html, LitElement, PropertyValues} from 'lit';
 import {customElement, property, query, state} from 'lit/decorators.js';
+import {when} from 'lit/directives/when.js';
 import {
   NumericChangeId,
   BranchName,
@@ -21,6 +22,7 @@
 import {sharedStyles} from '../../../styles/shared-styles';
 import {ValueChangedEvent} from '../../../types/events';
 import {throwingErrorCallback} from '../../shared/gr-rest-api-interface/gr-rest-apis/gr-rest-api-helper';
+import {KnownExperimentId} from '../../../services/flags/flags';
 
 export interface RebaseChange {
   name: string;
@@ -30,6 +32,7 @@
 export interface ConfirmRebaseEventDetail {
   base: string | null;
   allowConflicts: boolean;
+  rebaseChain: boolean;
 }
 
 @customElement('gr-confirm-rebase-dialog')
@@ -85,11 +88,16 @@
   @query('#rebaseAllowConflicts')
   private rebaseAllowConflicts!: HTMLInputElement;
 
+  @query('#rebaseChain')
+  private rebaseChain?: HTMLInputElement;
+
   @query('#parentInput')
   parentInput!: GrAutocomplete;
 
   private readonly restApiService = getAppContext().restApiService;
 
+  private readonly flagsService = getAppContext().flagsService;
+
   constructor() {
     super();
     this.query = input => this.getChangeSuggestions(input);
@@ -221,6 +229,14 @@
               >Allow rebase with conflicts</label
             >
           </div>
+          ${when(
+            this.flagsService.isEnabled(KnownExperimentId.REBASE_CHAIN),
+            () =>
+              html`<div>
+                <input id="rebaseChain" type="checkbox" />
+                <label for="rebaseChain">Rebase all ancestors</label>
+              </div>`
+          )}
         </div>
       </gr-dialog>
     `;
@@ -326,6 +342,7 @@
     const detail: ConfirmRebaseEventDetail = {
       base: this.getSelectedBase(),
       allowConflicts: this.rebaseAllowConflicts.checked,
+      rebaseChain: !!this.rebaseChain?.checked,
     };
     this.dispatchEvent(new CustomEvent('confirm', {detail}));
     this.text = '';
diff --git a/polygerrit-ui/app/services/flags/flags.ts b/polygerrit-ui/app/services/flags/flags.ts
index 572e107..2a5dff2 100644
--- a/polygerrit-ui/app/services/flags/flags.ts
+++ b/polygerrit-ui/app/services/flags/flags.ts
@@ -22,4 +22,5 @@
   SUGGEST_EDIT = 'UiFeature__suggest_edit',
   MENTION_USERS = 'UiFeature__mention_users',
   RENDER_MARKDOWN = 'UiFeature__render_markdown',
+  REBASE_CHAIN = 'UiFeature__rebase_chain',
 }