diff --git a/packages/blockly/core/comments/collapse_comment_bar_button.ts b/packages/blockly/core/comments/collapse_comment_bar_button.ts
index 304e2af8125..61b4f7b60f9 100644
--- a/packages/blockly/core/comments/collapse_comment_bar_button.ts
+++ b/packages/blockly/core/comments/collapse_comment_bar_button.ts
@@ -5,6 +5,7 @@
  */
 
 import * as browserEvents from '../browser_events.js';
+import {Msg} from '../msg.js';
 import * as touch from '../touch.js';
 import * as dom from '../utils/dom.js';
 import {Svg} from '../utils/svg.js';
@@ -56,6 +57,7 @@ export class CollapseCommentBarButton extends CommentBarButton {
       },
       this.container,
     );
+    this.recomputeAriaContext();
     this.bindId = browserEvents.conditionalBind(
       this.icon,
       'pointerdown',
@@ -95,8 +97,22 @@ export class CollapseCommentBarButton extends CommentBarButton {
     }
 
     this.getCommentView().setCollapsed(!this.getCommentView().isCollapsed());
+    this.recomputeAriaContext();
     this.workspace.hideChaff();
 
     e?.stopPropagation();
   }
+
+  /**
+   * Returns the ARIA label to use for this button (defaults to null). Note that this
+   * method will only be called and apply when recomputeAriaContext is called.
+   *
+   * @returns The ARIA label to use for this button, or null to use a default.
+   */
+  protected getAriaLabel(): string {
+    const isCollapsed = this.getCommentView().isCollapsed();
+    return isCollapsed
+      ? Msg['ARIA_LABEL_COMMENT_EXPAND']
+      : Msg['ARIA_LABEL_COMMENT_COLLAPSE'];
+  }
 }
diff --git a/packages/blockly/core/comments/comment_bar_button.ts b/packages/blockly/core/comments/comment_bar_button.ts
index be130b0e335..c4d10b975e3 100644
--- a/packages/blockly/core/comments/comment_bar_button.ts
+++ b/packages/blockly/core/comments/comment_bar_button.ts
@@ -5,6 +5,8 @@
  */
 
 import type {IFocusableNode} from '../interfaces/i_focusable_node.js';
+import {Msg} from '../msg.js';
+import * as aria from '../utils/aria.js';
 import {Rect} from '../utils/rect.js';
 import type {WorkspaceSvg} from '../workspace_svg.js';
 import type {CommentView} from './comment_view.js';
@@ -102,4 +104,33 @@ export abstract class CommentBarButton implements IFocusableNode {
   canBeFocused() {
     return this.isVisible();
   }
+
+  /**
+   * Recomputes the ARIA label and role for this button. Note that this is not
+   * automatically called during initialization and must be called once a button's
+   * focusable element (icon) is initialized. Implementations may also find it useful
+   * to call this if the button's label should be changed.
+   */
+  protected recomputeAriaContext(): void {
+    if (!this.icon) return;
+
+    aria.setRole(this.icon, aria.Role.BUTTON);
+
+    const label = this.getAriaLabel();
+    aria.setState(
+      this.icon,
+      aria.State.LABEL,
+      label || Msg['ARIA_LABEL_BUTTON'],
+    );
+  }
+
+  /**
+   * Returns the ARIA label to use for this button (defaults to null). Note that this
+   * method will only be called and apply when recomputeAriaContext is called.
+   *
+   * @returns The ARIA label to use for this button, or null to use a default.
+   */
+  protected getAriaLabel(): string | null {
+    return null;
+  }
 }
diff --git a/packages/blockly/core/comments/comment_editor.ts b/packages/blockly/core/comments/comment_editor.ts
index 5d41a7c3866..6d03cc9c08c 100644
--- a/packages/blockly/core/comments/comment_editor.ts
+++ b/packages/blockly/core/comments/comment_editor.ts
@@ -4,18 +4,21 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+import {BlockSvg} from '../block_svg.js';
 import * as browserEvents from '../browser_events.js';
 import {getFocusManager} from '../focus_manager.js';
 import {IFocusableNode} from '../interfaces/i_focusable_node.js';
 import {IFocusableTree} from '../interfaces/i_focusable_tree.js';
 import {Msg} from '../msg.js';
 import * as touch from '../touch.js';
+import * as aria from '../utils/aria.js';
 import * as dom from '../utils/dom.js';
 import {Rect} from '../utils/rect.js';
 import {Size} from '../utils/size.js';
 import {Svg} from '../utils/svg.js';
 import * as svgMath from '../utils/svg_math.js';
 import {WorkspaceSvg} from '../workspace_svg.js';
+import {RenderedWorkspaceComment} from './rendered_workspace_comment.js';
 
 /**
  * String added to the ID of a workspace comment to identify
@@ -40,6 +43,9 @@ export class CommentEditor implements IFocusableNode {
   /** The current text of the comment. Updates on text area change. */
   private text: string = '';
 
+  /** The parent object that owns this comment editor. */
+  private parent?: BlockSvg | RenderedWorkspaceComment;
+
   constructor(
     public workspace: WorkspaceSvg,
     commentId: string,
@@ -57,6 +63,7 @@ export class CommentEditor implements IFocusableNode {
     ) as HTMLTextAreaElement;
     this.textArea.setAttribute('tabindex', '-1');
     this.textArea.setAttribute('dir', this.workspace.RTL ? 'RTL' : 'LTR');
+    aria.setRole(this.textArea, aria.Role.TEXTBOX);
     this.textArea.setAttribute(
       'placeholder',
       Msg['WORKSPACE_COMMENT_DEFAULT_TEXT'],
@@ -129,6 +136,23 @@ export class CommentEditor implements IFocusableNode {
     this.onTextChange();
   }
 
+  /**
+   * Sets the parent object that owns this comment editor.
+   *
+   * @param newParent The parent of this comment editor.
+   * @internal
+   */
+  setParent(newParent: BlockSvg | RenderedWorkspaceComment): void {
+    this.parent = newParent;
+  }
+
+  /**
+   * Returns the parent object that owns this comment editor, if any.
+   */
+  getParent(): BlockSvg | RenderedWorkspaceComment | undefined {
+    return this.parent;
+  }
+
   /**
    * Triggers listeners when the text of the comment changes, either
    * programmatically or manually by the user.
diff --git a/packages/blockly/core/comments/comment_view.ts b/packages/blockly/core/comments/comment_view.ts
index b1cd628f8dd..dec6df2af5e 100644
--- a/packages/blockly/core/comments/comment_view.ts
+++ b/packages/blockly/core/comments/comment_view.ts
@@ -6,10 +6,11 @@
 
 import * as browserEvents from '../browser_events.js';
 import * as css from '../css.js';
-import type {IFocusableNode} from '../interfaces/i_focusable_node';
 import {IRenderedElement} from '../interfaces/i_rendered_element.js';
 import * as layers from '../layers.js';
+import {Msg} from '../msg.js';
 import * as touch from '../touch.js';
+import * as aria from '../utils/aria.js';
 import {Coordinate} from '../utils/coordinate.js';
 import * as dom from '../utils/dom.js';
 import * as drag from '../utils/drag.js';
@@ -107,6 +108,12 @@ export class CommentView implements IRenderedElement {
     this.svgRoot = dom.createSvgElement(Svg.G, {
       'class': 'blocklyComment blocklyEditable blocklyDraggable',
     });
+    aria.setRole(this.svgRoot, aria.Role.BUTTON);
+    aria.setState(
+      this.svgRoot,
+      aria.State.ROLEDESCRIPTION,
+      Msg['ARIA_LABEL_COMMENT'],
+    );
 
     this.highlightRect = this.createHighlightRect(this.svgRoot);
 
@@ -120,6 +127,11 @@ export class CommentView implements IRenderedElement {
     } = this.createTopBar(this.svgRoot));
 
     this.commentEditor = this.createTextArea();
+    aria.setState(
+      this.svgRoot,
+      aria.State.LABELLEDBY,
+      this.commentEditor.getFocusableElement().id,
+    );
 
     this.resizeHandle = this.createResizeHandle(this.svgRoot, workspace);
 
@@ -235,7 +247,7 @@ export class CommentView implements IRenderedElement {
    *
    * @returns The FocusableNode representing the editor portion of this comment.
    */
-  getEditorFocusableNode(): IFocusableNode {
+  getEditorFocusableNode(): CommentEditor {
     return this.commentEditor;
   }
 
diff --git a/packages/blockly/core/comments/delete_comment_bar_button.ts b/packages/blockly/core/comments/delete_comment_bar_button.ts
index 15ed4b2598b..6f470455f0d 100644
--- a/packages/blockly/core/comments/delete_comment_bar_button.ts
+++ b/packages/blockly/core/comments/delete_comment_bar_button.ts
@@ -6,6 +6,7 @@
 
 import * as browserEvents from '../browser_events.js';
 import {getFocusManager} from '../focus_manager.js';
+import {Msg} from '../msg.js';
 import * as touch from '../touch.js';
 import * as dom from '../utils/dom.js';
 import {Svg} from '../utils/svg.js';
@@ -56,6 +57,7 @@ export class DeleteCommentBarButton extends CommentBarButton {
       },
       container,
     );
+    this.recomputeAriaContext();
     this.bindId = browserEvents.conditionalBind(
       this.icon,
       'pointerdown',
@@ -104,4 +106,14 @@ export class DeleteCommentBarButton extends CommentBarButton {
     getFocusManager().focusNode(this.workspace);
     this.workspace.getAudioManager().play('delete');
   }
+
+  /**
+   * Returns the ARIA label to use for this button (defaults to null). Note that this
+   * method will only be called and apply when recomputeAriaContext is called.
+   *
+   * @returns The ARIA label to use for this button, or null to use a default.
+   */
+  protected getAriaLabel(): string {
+    return Msg['REMOVE_COMMENT'];
+  }
 }
diff --git a/packages/blockly/core/comments/rendered_workspace_comment.ts b/packages/blockly/core/comments/rendered_workspace_comment.ts
index 5edafd5fe8a..f60e5bae865 100644
--- a/packages/blockly/core/comments/rendered_workspace_comment.ts
+++ b/packages/blockly/core/comments/rendered_workspace_comment.ts
@@ -59,6 +59,7 @@ export class RenderedWorkspaceComment
     this.workspace = workspace;
 
     this.view = new CommentView(workspace, this.id);
+    this.view.getEditorFocusableNode().setParent(this);
     // Set the size to the default size as defined in the superclass.
     this.view.setSize(this.getSize());
     this.view.setEditable(this.isEditable());
diff --git a/packages/blockly/core/icons/comment_icon.ts b/packages/blockly/core/icons/comment_icon.ts
index eb485b062a2..a60bad070a7 100644
--- a/packages/blockly/core/icons/comment_icon.ts
+++ b/packages/blockly/core/icons/comment_icon.ts
@@ -370,6 +370,7 @@ export class CommentIcon extends Icon implements IHasBubble, ISerializable {
       this.getBubbleOwnerRect(),
       this,
     );
+    this.textInputBubble.getEditor().setParent(this.sourceBlock as BlockSvg);
     this.textInputBubble.setText(this.getText());
     this.textInputBubble.setSize(this.bubbleSize, true);
     if (this.bubbleLocation) {
diff --git a/packages/blockly/msg/json/en.json b/packages/blockly/msg/json/en.json
index 3513b2e8cfd..ae94255e7a3 100644
--- a/packages/blockly/msg/json/en.json
+++ b/packages/blockly/msg/json/en.json
@@ -1,7 +1,7 @@
 {
 	"@metadata": {
 		"author": "Ellen Spertus <ellen.spertus@gmail.com>",
-		"lastupdated": "2026-05-06 14:12:59.060731",
+		"lastupdated": "2026-05-07 12:03:23.440539",
 		"locale": "en",
 		"messagedocumentation" : "qqq"
 	},
@@ -514,5 +514,8 @@
 	"ICON_LABEL_MUTATOR_CLOSED": "Edit this block",
 	"ICON_LABEL_MUTATOR_OPEN": "Close block editor",
 	"ICON_LABEL_WARNING_CLOSED": "Open Warning",
-	"ICON_LABEL_WARNING_OPEN": "Close Warning"
+	"ICON_LABEL_WARNING_OPEN": "Close Warning",
+	"ARIA_LABEL_COMMENT": "Comment",
+	"ARIA_LABEL_COMMENT_COLLAPSE": "Collapse Comment",
+	"ARIA_LABEL_COMMENT_EXPAND": "Expand Comment"
 }
diff --git a/packages/blockly/msg/json/qqq.json b/packages/blockly/msg/json/qqq.json
index 4fc7a0b53f0..49e642f935f 100644
--- a/packages/blockly/msg/json/qqq.json
+++ b/packages/blockly/msg/json/qqq.json
@@ -522,5 +522,8 @@
 	"ICON_LABEL_MUTATOR_CLOSED": "Label for an icon, used by screen readers to identify a closed mutator. Clicking on the icon opens the mutator's bubble, which allows the user to edit the block's structure.",
 	"ICON_LABEL_MUTATOR_OPEN": "Label for an icon, used by screen readers to identify an open mutator. Clicking on the icon closes the mutator's bubble.",
 	"ICON_LABEL_WARNING_CLOSED": "Label for an icon, used by screen readers to identify a closed warning. Clicking on the icon opens the warning's bubble, which allows the user read the warning.",
-	"ICON_LABEL_WARNING_OPEN": "Label for an icon, used by screen readers to identify an open warning. Clicking on the icon closes the warning's bubble."
+	"ICON_LABEL_WARNING_OPEN": "Label for an icon, used by screen readers to identify an open warning. Clicking on the icon closes the warning's bubble.",
+	"ARIA_LABEL_COMMENT": "ARIA label for a comment.",
+	"ARIA_LABEL_COMMENT_COLLAPSE": "ARIA label for an expanded comment's collapse button.",
+	"ARIA_LABEL_COMMENT_EXPAND": "ARIA label for a collapsed comment's expand button."
 }
diff --git a/packages/blockly/msg/messages.js b/packages/blockly/msg/messages.js
index 82ccae166ff..c592dd67981 100644
--- a/packages/blockly/msg/messages.js
+++ b/packages/blockly/msg/messages.js
@@ -2037,4 +2037,13 @@ Blockly.Msg.ICON_LABEL_MUTATOR_OPEN = 'Close block editor';
 Blockly.Msg.ICON_LABEL_WARNING_CLOSED = 'Open Warning';
 /** @type {string} */
 /// Label for an icon, used by screen readers to identify an open warning. Clicking on the icon closes the warning's bubble.
-Blockly.Msg.ICON_LABEL_WARNING_OPEN = 'Close Warning';
\ No newline at end of file
+Blockly.Msg.ICON_LABEL_WARNING_OPEN = 'Close Warning';
+/** @type {string} */
+/// ARIA label for a comment.
+Blockly.Msg.ARIA_LABEL_COMMENT = 'Comment';
+/** @type {string} */
+/// ARIA label for an expanded comment's collapse button.
+Blockly.Msg.ARIA_LABEL_COMMENT_COLLAPSE = 'Collapse Comment';
+/** @type {string} */
+/// ARIA label for a collapsed comment's expand button.
+Blockly.Msg.ARIA_LABEL_COMMENT_EXPAND = 'Expand Comment';
\ No newline at end of file
diff --git a/packages/blockly/tests/mocha/comment_test.js b/packages/blockly/tests/mocha/comment_test.js
index 087c7f66162..eb0f6ab9d75 100644
--- a/packages/blockly/tests/mocha/comment_test.js
+++ b/packages/blockly/tests/mocha/comment_test.js
@@ -223,6 +223,14 @@ suite('Comments', function () {
     function getFocusableAriaLabel(iFocusable) {
       return iFocusable.getFocusableElement().getAttribute('aria-label');
     }
+    function getFocusableAriaRole(iFocusable) {
+      return iFocusable.getFocusableElement().getAttribute('role');
+    }
+    function getFocusableAriaDescription(iFocusable) {
+      return iFocusable
+        .getFocusableElement()
+        .getAttribute('aria-roledescription');
+    }
     test('Bubble has ARIA label', function () {
       assert.isTrue(this.bubble.focusableElement.hasAttribute('aria-label'));
     });
@@ -265,5 +273,85 @@ suite('Comments', function () {
       const updatedLabel = getFocusableAriaLabel(this.bubble);
       assert.include(updatedLabel, 'updated text');
     });
+    suite('Comment Editor', function () {
+      test('Has ARIA role textbox', function () {
+        const editor = this.bubble.editor;
+        assert.equal(
+          editor.getFocusableElement().getAttribute('role'),
+          'textbox',
+        );
+      });
+      test('Parent is initialized', function () {
+        const editor = this.bubble.getEditor();
+        assert.exists(editor.getParent());
+      });
+    });
+    suite('Comment View', function () {
+      setup(function () {
+        // Create workspace comment to test comment view ARIA attributes, since block comments use bubbles.
+        this.workspaceComment = this.workspace.newComment();
+        this.workspaceComment.setText('workspace comment');
+      });
+      test('Has ARIA role button', function () {
+        const view = this.workspaceComment.view;
+        assert.equal(view.svgRoot.getAttribute('role'), 'button');
+      });
+      test('Has ARIA roledescription of comment', function () {
+        const view = this.workspaceComment.view;
+        assert.equal(
+          view.svgRoot.getAttribute('aria-roledescription'),
+          'Comment',
+        );
+      });
+      test('Comment view is labelled by comment editor', function () {
+        const view = this.workspaceComment.view;
+        const ownerId = view.commentEditor.getFocusableElement().id;
+        assert.equal(view.svgRoot.getAttribute('aria-labelledby'), ownerId);
+      });
+    });
+    suite('Comment Bar Buttons', function () {
+      setup(function () {
+        this.comment = this.workspace.newComment();
+        this.comment.setText('test comment');
+
+        this.view = this.comment.view;
+      });
+      function getButtonLabel(button) {
+        return button.getFocusableElement().getAttribute('aria-label');
+      }
+      test('Buttons have ARIA role button', function () {
+        for (const button of this.view.getCommentBarButtons()) {
+          assert.equal(
+            button.getFocusableElement().getAttribute('role'),
+            'button',
+          );
+        }
+      });
+      test('Delete button has correct ARIA label', function () {
+        assert.equal(getButtonLabel(this.view.deleteButton), 'Remove Comment');
+      });
+      test('Collapse button has initial ARIA label', function () {
+        assert.include(
+          getButtonLabel(this.view.foldoutButton),
+          'Collapse Comment',
+        );
+      });
+      test('Collapse button updates ARIA label when toggled', function () {
+        const initial = getButtonLabel(this.view.foldoutButton);
+        assert.include(initial, 'Collapse Comment');
+
+        this.view.foldoutButton.performAction();
+
+        const updated = getButtonLabel(this.view.foldoutButton);
+        assert.include(updated, 'Expand Comment');
+      });
+      test('Buttons recompute ARIA context after creation', function () {
+        for (const button of this.view.getCommentBarButtons()) {
+          assert.isNotNull(
+            button.getFocusableElement().getAttribute('aria-label'),
+          );
+        }
+      });
+    });
   });
 });