diff --git a/packages/components/CHANGELOG.md b/packages/components/CHANGELOG.md
index e0b6a6d071e130..630b26bad2f797 100644
--- a/packages/components/CHANGELOG.md
+++ b/packages/components/CHANGELOG.md
@@ -6,6 +6,7 @@
 
 -   `Guide`: Use small size button for page controls ([#66607](https://github.com/WordPress/gutenberg/pull/66607)).
 -   `PaletteEdit`: Add appropriate size props to Buttons ([#66590](https://github.com/WordPress/gutenberg/pull/66590)).
+-   `Notice`: Add appropriate size props to Buttons ([#66593](https://github.com/WordPress/gutenberg/pull/66593)).
 
 ### Internal
 
diff --git a/packages/components/src/notice/index.tsx b/packages/components/src/notice/index.tsx
index 868576ecc9aa3f..6f3ca94d4f734a 100644
--- a/packages/components/src/notice/index.tsx
+++ b/packages/components/src/notice/index.tsx
@@ -142,6 +142,7 @@ function Notice( {
 
 							return (
 								<Button
+									__next40pxDefaultSize
 									key={ index }
 									href={ url }
 									variant={ computedVariant }
@@ -160,6 +161,7 @@ function Notice( {
 			</div>
 			{ isDismissible && (
 				<Button
+					size="small"
 					className="components-notice__dismiss"
 					icon={ close }
 					label={ __( 'Close' ) }
diff --git a/packages/components/src/notice/stories/index.story.tsx b/packages/components/src/notice/stories/index.story.tsx
index 3314fc722af969..95bf82016c2b04 100644
--- a/packages/components/src/notice/stories/index.story.tsx
+++ b/packages/components/src/notice/stories/index.story.tsx
@@ -109,7 +109,11 @@ export const NoticeListSubcomponent: StoryFn< typeof NoticeList > = () => {
 	return (
 		<>
 			<NoticeList notices={ notices } onRemove={ removeNotice } />
-			<Button variant="primary" onClick={ resetNotices }>
+			<Button
+				__next40pxDefaultSize
+				variant="primary"
+				onClick={ resetNotices }
+			>
 				Reset Notices
 			</Button>
 		</>
diff --git a/packages/components/src/notice/test/__snapshots__/index.tsx.snap b/packages/components/src/notice/test/__snapshots__/index.tsx.snap
index c74d6fdd0a6fc9..77abecf14264be 100644
--- a/packages/components/src/notice/test/__snapshots__/index.tsx.snap
+++ b/packages/components/src/notice/test/__snapshots__/index.tsx.snap
@@ -21,19 +21,19 @@ exports[`Notice should match snapshot 1`] = `
         class="components-notice__actions"
       >
         <a
-          class="components-button components-notice__action is-link"
+          class="components-button components-notice__action is-next-40px-default-size is-link"
           href="https://example.com"
         >
           More information
         </a>
         <button
-          class="components-button components-notice__action is-secondary"
+          class="components-button components-notice__action is-next-40px-default-size is-secondary"
           type="button"
         >
           Cancel
         </button>
         <button
-          class="components-button components-notice__action is-primary"
+          class="components-button components-notice__action is-next-40px-default-size is-primary"
           type="button"
         >
           Submit
@@ -42,7 +42,7 @@ exports[`Notice should match snapshot 1`] = `
     </div>
     <button
       aria-label="Close"
-      class="components-button components-notice__dismiss has-icon"
+      class="components-button components-notice__dismiss is-small has-icon"
       type="button"
     >
       <svg