diff --git a/l10n/en-US/viewer.ftl b/l10n/en-US/viewer.ftl
index 3b3760605..9c6636de7 100644
--- a/l10n/en-US/viewer.ftl
+++ b/l10n/en-US/viewer.ftl
@@ -561,6 +561,7 @@ pdfjs-editor-undo-bar-message-freetext = Text removed
 pdfjs-editor-undo-bar-message-ink = Drawing removed
 pdfjs-editor-undo-bar-message-stamp = Image removed
 pdfjs-editor-undo-bar-message-signature = Signature removed
+pdfjs-editor-undo-bar-message-comment = Comment removed
 # Variables:
 #   $count (Number) - the number of removed annotations.
 pdfjs-editor-undo-bar-message-multiple =
diff --git a/src/display/editor/tools.js b/src/display/editor/tools.js
index 84d2f23c2..feafa2003 100644
--- a/src/display/editor/tools.js
+++ b/src/display/editor/tools.js
@@ -1177,6 +1177,22 @@ class AnnotationEditorUIManager {
     this.#commentManager?.removeComments([editor.uid]);
   }
 
+  /**
+   * Delete a comment from an editor with undo support.
+   * @param {AnnotationEditor} editor - The editor whose comment to delete.
+   * @param {string} savedComment - The comment text to save for undo.
+   */
+  deleteComment(editor, savedComment) {
+    const undo = () => {
+      editor.comment = savedComment;
+    };
+    const cmd = () => {
+      this._editorUndoBar?.show(undo, "comment");
+      editor.comment = null;
+    };
+    this.addCommands({ cmd, undo, mustExec: true });
+  }
+
   toggleComment(editor, isSelected, visibility = undefined) {
     this.#commentManager?.toggleCommentPopup(editor, isSelected, visibility);
   }
diff --git a/test/integration/comment_spec.mjs b/test/integration/comment_spec.mjs
index fc97906ac..36bebb3b6 100644
--- a/test/integration/comment_spec.mjs
+++ b/test/integration/comment_spec.mjs
@@ -965,4 +965,159 @@ describe("Comment", () => {
       );
     });
   });
+
+  describe("Undo deletion popup for comments (bug 1999154)", () => {
+    let pages;
+
+    beforeEach(async () => {
+      pages = await loadAndWait(
+        "tracemonkey.pdf",
+        ".annotationEditorLayer",
+        "page-fit",
+        null,
+        { enableComment: true }
+      );
+    });
+
+    afterEach(async () => {
+      await closePages(pages);
+    });
+
+    it("must check that deleting a comment can be undone using the undo button", async () => {
+      await Promise.all(
+        pages.map(async ([browserName, page]) => {
+          await switchToHighlight(page);
+          await highlightSpan(page, 1, "Abstract");
+          const editorSelector = getEditorSelector(0);
+          const comment = "Test comment for undo";
+          await editComment(page, editorSelector, comment);
+
+          // Stay in highlight mode - don't disable it
+          await waitAndClick(
+            page,
+            `${editorSelector} .annotationCommentButton`
+          );
+
+          await page.waitForSelector("#commentPopup", { visible: true });
+          await waitAndClick(page, "button.commentPopupDelete");
+
+          await page.waitForSelector("#editorUndoBar", { visible: true });
+          await page.waitForSelector("#editorUndoBarUndoButton", {
+            visible: true,
+          });
+          await page.click("#editorUndoBarUndoButton");
+
+          // Check that the comment is restored by hovering to show the popup
+          await page.hover(`${editorSelector} .annotationCommentButton`);
+          await page.waitForSelector("#commentPopup", { visible: true });
+          const popupText = await page.evaluate(
+            () =>
+              document.querySelector("#commentPopup .commentPopupText")
+                ?.textContent
+          );
+          expect(popupText).withContext(`In ${browserName}`).toEqual(comment);
+        })
+      );
+    });
+
+    it("must check that the undo deletion popup displays 'Comment removed' message", async () => {
+      await Promise.all(
+        pages.map(async ([browserName, page]) => {
+          await switchToHighlight(page);
+          await highlightSpan(page, 1, "Abstract");
+          const editorSelector = getEditorSelector(0);
+          await editComment(page, editorSelector, "Test comment");
+
+          // Stay in highlight mode - don't disable it
+          await waitAndClick(
+            page,
+            `${editorSelector} .annotationCommentButton`
+          );
+
+          await page.waitForSelector("#commentPopup", { visible: true });
+          await waitAndClick(page, "button.commentPopupDelete");
+
+          await page.waitForFunction(() => {
+            const messageElement = document.querySelector(
+              "#editorUndoBarMessage"
+            );
+            return messageElement && messageElement.textContent.trim() !== "";
+          });
+          const message = await page.waitForSelector("#editorUndoBarMessage");
+          const messageText = await page.evaluate(
+            el => el.textContent,
+            message
+          );
+          expect(messageText)
+            .withContext(`In ${browserName}`)
+            .toContain("Comment removed");
+        })
+      );
+    });
+
+    it("must check that the undo bar closes when clicking the close button", async () => {
+      await Promise.all(
+        pages.map(async ([browserName, page]) => {
+          await switchToHighlight(page);
+          await highlightSpan(page, 1, "Abstract");
+          const editorSelector = getEditorSelector(0);
+          await editComment(page, editorSelector, "Test comment");
+
+          // Stay in highlight mode - don't disable it
+          await waitAndClick(
+            page,
+            `${editorSelector} .annotationCommentButton`
+          );
+
+          await page.waitForSelector("#commentPopup", { visible: true });
+          await waitAndClick(page, "button.commentPopupDelete");
+
+          await page.waitForSelector("#editorUndoBar", { visible: true });
+          await waitAndClick(page, "#editorUndoBarCloseButton");
+          await page.waitForSelector("#editorUndoBar", { hidden: true });
+        })
+      );
+    });
+
+    it("must check that deleting a comment can be undone using Ctrl+Z", async () => {
+      await Promise.all(
+        pages.map(async ([browserName, page]) => {
+          await switchToHighlight(page);
+          await highlightSpan(page, 1, "Abstract");
+          const editorSelector = getEditorSelector(0);
+          const comment = "Test comment for Ctrl+Z undo";
+          await editComment(page, editorSelector, comment);
+
+          // Stay in highlight mode - don't disable it
+          await waitAndClick(
+            page,
+            `${editorSelector} .annotationCommentButton`
+          );
+
+          await page.waitForSelector("#commentPopup", { visible: true });
+          await waitAndClick(page, "button.commentPopupDelete");
+
+          await page.waitForSelector("#editorUndoBar", { visible: true });
+
+          // Use Ctrl+Z to undo
+          await kbModifierDown(page);
+          await page.keyboard.press("z");
+          await kbModifierUp(page);
+
+          // The undo bar should be hidden after undo
+          await page.waitForSelector("#editorUndoBar", { hidden: true });
+
+          // Check that the comment is restored by hovering to show the popup
+          await page.hover(`${editorSelector} .annotationCommentButton`);
+          await page.waitForSelector("#commentPopup", { visible: true });
+          const popupText = await page.evaluate(
+            () =>
+              document.querySelector("#commentPopup .commentPopupText")
+                ?.textContent
+          );
+          expect(popupText).withContext(`In ${browserName}`).toEqual(comment);
+        })
+      );
+    });
+  });
 });
diff --git a/web/comment_manager.js b/web/comment_manager.js
index 0b7bb268d..438d85f78 100644
--- a/web/comment_manager.js
+++ b/web/comment_manager.js
@@ -982,9 +982,15 @@ class CommentPopup {
           },
         },
       });
-      this.#editor.comment = null;
-      this.#editor.focus();
+      const savedComment = this.#editor.comment?.text;
+      const editor = this.#editor;
       this.destroy();
+      if (savedComment) {
+        editor._uiManager.deleteComment(editor, savedComment);
+      } else {
+        editor.comment = null;
+      }
+      editor.focus();
     });
     del.addEventListener("contextmenu", noContextMenu);
     buttons.append(edit, del);
diff --git a/web/editor_undo_bar.js b/web/editor_undo_bar.js
index 096547062..1cb3ed90a 100644
--- a/web/editor_undo_bar.js
+++ b/web/editor_undo_bar.js
@@ -40,6 +40,7 @@ class EditorUndoBar {
     stamp: "pdfjs-editor-undo-bar-message-stamp",
     ink: "pdfjs-editor-undo-bar-message-ink",
     signature: "pdfjs-editor-undo-bar-message-signature",
+    comment: "pdfjs-editor-undo-bar-message-comment",
     _multiple: "pdfjs-editor-undo-bar-message-multiple",
   });