diff --git a/packages/components/CHANGELOG.md b/packages/components/CHANGELOG.md
index afaf301d6bf964..5eb8eda2b3b1aa 100644
--- a/packages/components/CHANGELOG.md
+++ b/packages/components/CHANGELOG.md
@@ -8,6 +8,10 @@
 
 -   `TextControl`: Add typings for `date`, `time` and `datetime-local` ([#59666](https://github.com/WordPress/gutenberg/pull/59666)).
 
+### Deprecation
+
+-   `isSmall` prop in `Button` component has been deprecated. Use `size="small"` prop instead ([#59734](https://github.com/WordPress/gutenberg/pull/59734)).
+
 ### Internal
 
 -   `Button`: Keep deprecated props in type definitions ([#59913](https://github.com/WordPress/gutenberg/pull/59913)).
diff --git a/packages/components/src/button/test/index.tsx b/packages/components/src/button/test/index.tsx
index 2b4a610c50bea0..9d8980e04c9313 100644
--- a/packages/components/src/button/test/index.tsx
+++ b/packages/components/src/button/test/index.tsx
@@ -43,7 +43,7 @@ describe( 'Button', () => {
 		} );
 
 		it( 'should render a button element with is-secondary and is-small class', () => {
-			render( <Button variant="secondary" isSmall /> );
+			render( <Button variant="secondary" size="small" /> );
 			const button = screen.getByRole( 'button' );
 
 			expect( button ).toHaveClass( 'is-secondary' );
diff --git a/packages/components/src/button/types.ts b/packages/components/src/button/types.ts
index 447ad1de79e358..ce6db4b3e914bc 100644
--- a/packages/components/src/button/types.ts
+++ b/packages/components/src/button/types.ts
@@ -61,15 +61,6 @@ type BaseButtonProps = {
 	 * Renders a pressed button style.
 	 */
 	isPressed?: boolean;
-	// TODO: Deprecate officially (add console warning and move to DeprecatedButtonProps).
-	/**
-	 * Decreases the size of the button.
-	 *
-	 * Deprecated in favor of the `size` prop. If both props are defined, the `size` prop will take precedence.
-	 *
-	 * @deprecated Use the `'small'` value on the `size` prop instead.
-	 */
-	isSmall?: boolean;
 	/**
 	 * Sets the `aria-label` of the component, if none is provided.
 	 * Sets the Tooltip content if `showTooltip` is provided.
@@ -184,6 +175,13 @@ export type DeprecatedButtonProps = {
 	 * @ignore
 	 */
 	isTertiary?: boolean;
+	/**
+	 * Decreases the size of the button.
+	 *
+	 * @deprecated Use the `'small'` value on the `size` prop instead.
+	 * @ignore
+	 */
+	isSmall?: boolean;
 };
 
 export type DeprecatedIconButtonProps = {