diff --git a/.changeset/data-table-action-cell.md b/.changeset/data-table-action-cell.md
new file mode 100644
index 000000000..a3d5c9944
--- /dev/null
+++ b/.changeset/data-table-action-cell.md
@@ -0,0 +1,5 @@
+---
+"@slack/types": minor
+---
+
+feat(types): support `action_cell` cells in [`data_table`](https://docs.slack.dev/reference/block-kit/blocks/data-table-block) block rows with the new `ActionCellElement` type
diff --git a/packages/types/src/block-kit/blocks.ts b/packages/types/src/block-kit/blocks.ts
index 9237fbbea..2aed8fabe 100644
--- a/packages/types/src/block-kit/blocks.ts
+++ b/packages/types/src/block-kit/blocks.ts
@@ -26,6 +26,7 @@ import type {
   WorkflowButton,
 } from './block-elements';
 import type {
+  ActionCellElement,
   MrkdwnElement,
   PlainTextElement,
   RawNumberElement,
@@ -369,7 +370,7 @@ export interface DataTableBlock extends Block {
   /**
    * @description An array consisting of table rows.
    */
-  rows: (RawTextElement | RawNumberElement | RichTextBlock)[][];
+  rows: (ActionCellElement | RawTextElement | RawNumberElement | RichTextBlock)[][];
   /**
    * @description A caption for the table; used as the value for the HTML caption element.
    */
diff --git a/packages/types/src/block-kit/composition-objects.ts b/packages/types/src/block-kit/composition-objects.ts
index b36d1cf50..13ddb4876 100644
--- a/packages/types/src/block-kit/composition-objects.ts
+++ b/packages/types/src/block-kit/composition-objects.ts
@@ -1,5 +1,7 @@
 // This file contains objects documented here: https://docs.slack.dev/reference/block-kit/composition-objects
 
+import type { Button } from './block-elements';
+
 /**
  * Re-usable labels for common color schemes present in Slack. `danger` displays with a red background (red text on
  * mobile), while `primary` displays with a green background (green text on mobile).
@@ -173,6 +175,25 @@ export interface MrkdwnElement {
   verbatim?: boolean;
 }
 
+/**
+ * @description Defines a data table cell containing a button element.
+ * @see {@link https://docs.slack.dev/reference/block-kit/blocks/data-table-block#schema-action-cell Action cell reference}.
+ */
+export interface ActionCellElement {
+  /**
+   * @description The type of cell. In this case `type` is always `action_cell`.
+   */
+  type: 'action_cell';
+  /**
+   * @description A button element.
+   */
+  element: Button;
+  /**
+   * @description A raw_text or raw_number cell.
+   */
+  fallback?: RawTextElement | RawNumberElement;
+}
+
 /**
  * @description Defines an object containing a numeric value.
  */
diff --git a/packages/types/test/blocks.test-d.ts b/packages/types/test/blocks.test-d.ts
index 26e2525c8..d6169516c 100644
--- a/packages/types/test/blocks.test-d.ts
+++ b/packages/types/test/blocks.test-d.ts
@@ -179,6 +179,14 @@ expectError<DataTableBlock>({
   type: 'data_table',
   caption: 'A list of fruit and their quantities',
 }); // missing required rows
+expectError<DataTableBlock>({
+  type: 'data_table',
+  caption: 'A list of tasks',
+  rows: [
+    [{ type: 'raw_text', text: 'Action' }],
+    [{ type: 'action_cell', fallback: { type: 'raw_text', text: 'Open' } }],
+  ],
+}); // action_cell missing required element
 // -- happy path
 expectAssignable<DataTableBlock>({
   type: 'data_table',
@@ -211,6 +219,51 @@ expectAssignable<DataTableBlock>({
     ],
   ],
 });
+expectAssignable<DataTableBlock>({
+  type: 'data_table',
+  caption: 'A list of tasks',
+  rows: [
+    [
+      { type: 'raw_text', text: 'Task' },
+      { type: 'raw_text', text: 'Action' },
+    ],
+    [
+      { type: 'raw_text', text: 'Write docs' },
+      {
+        type: 'action_cell',
+        element: {
+          type: 'button',
+          text: { type: 'plain_text', text: 'Mark done' },
+          action_id: 'mark_done',
+          value: 'task_123',
+        },
+        fallback: { type: 'raw_text', text: 'Open' },
+      },
+    ],
+  ],
+});
+expectAssignable<DataTableBlock>({
+  type: 'data_table',
+  caption: 'A list of tasks',
+  rows: [
+    [
+      { type: 'raw_text', text: 'Task' },
+      { type: 'raw_text', text: 'Action' },
+    ],
+    [
+      { type: 'raw_text', text: 'Write docs' },
+      {
+        type: 'action_cell',
+        element: {
+          type: 'button',
+          text: { type: 'plain_text', text: 'Mark done' },
+          action_id: 'mark_done',
+          value: 'task_123',
+        },
+      },
+    ],
+  ],
+});
 expectAssignable<KnownBlock>({
   type: 'data_table',
   caption: 'A minimal table',
@@ -221,6 +274,24 @@ expectAssignable<KnownBlock>({
 // -- sad path
 expectError<TableBlock>({}); // missing type and rows
 expectError<TableBlock>({ type: 'table' }); // missing required rows
+expectError<TableBlock>({
+  type: 'table',
+  rows: [
+    [{ type: 'raw_text', text: 'Action' }],
+    [
+      {
+        type: 'action_cell',
+        element: {
+          type: 'button',
+          text: { type: 'plain_text', text: 'Mark done' },
+          action_id: 'mark_done',
+          value: 'task_123',
+        },
+        fallback: { type: 'raw_text', text: 'Open' },
+      },
+    ],
+  ],
+}); // action_cell is only allowed in data_table
 // -- happy path
 // Table cells can be rich_text, raw_text, or raw_number; column_settings describe column behavior.
 expectAssignable<TableBlock>({
diff --git a/packages/types/test/composition-objects.test-d.ts b/packages/types/test/composition-objects.test-d.ts
index 98a03259b..843084f3d 100644
--- a/packages/types/test/composition-objects.test-d.ts
+++ b/packages/types/test/composition-objects.test-d.ts
@@ -1,5 +1,46 @@
 import { expectAssignable, expectError } from 'tsd';
-import type { RawNumberElement, RawTextElement } from '../src/index';
+import type { ActionCellElement, RawNumberElement, RawTextElement } from '../src/index';
+
+// ActionCellElement
+// -- sad path
+expectError<ActionCellElement>({}); // missing type and element
+expectError<ActionCellElement>({ type: 'action_cell' }); // missing required element
+expectError<ActionCellElement>({ type: 'action_cell', fallback: { type: 'raw_text', text: 'Open' } }); // missing required element
+expectError<ActionCellElement>({
+  type: 'action_cell',
+  element: { type: 'button', text: { type: 'plain_text', text: 'Mark done' } },
+  fallback: { type: 'rich_text', elements: [] },
+}); // fallback must be raw_text or raw_number
+// -- happy path
+expectAssignable<ActionCellElement>({
+  type: 'action_cell',
+  element: {
+    type: 'button',
+    text: { type: 'plain_text', text: 'Mark done' },
+    action_id: 'mark_done',
+    value: 'task_123',
+  },
+  fallback: { type: 'raw_text', text: 'Open' },
+});
+expectAssignable<ActionCellElement>({
+  type: 'action_cell',
+  element: {
+    type: 'button',
+    text: { type: 'plain_text', text: 'Mark done' },
+    action_id: 'mark_done',
+    value: 'task_123',
+  },
+  fallback: { type: 'raw_number', value: 1, text: '1' },
+});
+expectAssignable<ActionCellElement>({
+  type: 'action_cell',
+  element: {
+    type: 'button',
+    text: { type: 'plain_text', text: 'Mark done' },
+    action_id: 'mark_done',
+    value: 'task_123',
+  },
+});
 
 // RawNumberElement
 // -- sad path