diff --git a/packages/components/CHANGELOG.md b/packages/components/CHANGELOG.md
index c9f63514c8a60..4676047d58454 100644
--- a/packages/components/CHANGELOG.md
+++ b/packages/components/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Deprecations
+
+-   `SelectControl`: Deprecate 36px default size ([#66898](https://github.com/WordPress/gutenberg/pull/66898)).
+
 ## 29.0.0 (2024-12-11)
 
 ### Breaking Changes
diff --git a/packages/components/src/dimension-control/index.tsx b/packages/components/src/dimension-control/index.tsx
index 2cc39379ebde0..ffdfaeb84ee51 100644
--- a/packages/components/src/dimension-control/index.tsx
+++ b/packages/components/src/dimension-control/index.tsx
@@ -113,6 +113,7 @@ export function DimensionControl( props: DimensionControlProps ) {
 		<ContextSystemProvider value={ CONTEXT_VALUE }>
 			<SelectControl
 				__next40pxDefaultSize={ __next40pxDefaultSize }
+				__shouldNotWarnDeprecated36pxSize
 				__nextHasNoMarginBottom={ __nextHasNoMarginBottom }
 				className={ clsx(
 					className,
diff --git a/packages/components/src/disabled/stories/index.story.tsx b/packages/components/src/disabled/stories/index.story.tsx
index f017305507814..591118681a82d 100644
--- a/packages/components/src/disabled/stories/index.story.tsx
+++ b/packages/components/src/disabled/stories/index.story.tsx
@@ -55,6 +55,7 @@ const Form = () => {
 			/>
 			<SelectControl
 				__nextHasNoMarginBottom
+				__next40pxDefaultSize
 				label="Select Control"
 				onChange={ () => {} }
 				options={ [
diff --git a/packages/components/src/input-control/types.ts b/packages/components/src/input-control/types.ts
index 13f078cd89cc1..99c5b1aea92c3 100644
--- a/packages/components/src/input-control/types.ts
+++ b/packages/components/src/input-control/types.ts
@@ -40,6 +40,13 @@ interface BaseProps {
 	 * @default false
 	 */
 	__next40pxDefaultSize?: boolean;
+	/**
+	 * Do not throw a warning for the deprecated 36px default size.
+	 * For internal components of other components that already throw the warning.
+	 *
+	 * @ignore
+	 */
+	__shouldNotWarnDeprecated36pxSize?: boolean;
 	__unstableInputWidth?: CSSProperties[ 'width' ];
 	/**
 	 * If true, the label will only be visible to screen readers.
diff --git a/packages/components/src/select-control/README.md b/packages/components/src/select-control/README.md
index c240243408fab..d8742fce74f54 100644
--- a/packages/components/src/select-control/README.md
+++ b/packages/components/src/select-control/README.md
@@ -92,6 +92,7 @@ const MySelectControl = () => {
 				{ label: 'Small', value: '25%' },
 			] }
 			onChange={ ( newSize ) => setSize( newSize ) }
+			__next40pxDefaultSize
 			__nextHasNoMarginBottom
 		/>
 	);
@@ -114,6 +115,7 @@ Render a user interface to select multiple users from a list.
 		{ value: 'b', label: 'User B' },
 		{ value: 'c', label: 'User c' },
 	] }
+	__next40pxDefaultSize
 	__nextHasNoMarginBottom
 />
 ```
@@ -129,6 +131,7 @@ const [ item, setItem ] = useState( '' );
     label={ __( 'My dinosaur' ) }
     value={ item } // e.g: value = 'a'
     onChange={ ( selection ) => { setItem( selection ) } }
+    __next40pxDefaultSize
     __nextHasNoMarginBottom
 >
 	<optgroup label="Theropods">
diff --git a/packages/components/src/select-control/index.tsx b/packages/components/src/select-control/index.tsx
index 3686661b8a58d..e93e9385a9c23 100644
--- a/packages/components/src/select-control/index.tsx
+++ b/packages/components/src/select-control/index.tsx
@@ -18,6 +18,7 @@ import type { WordPressComponentProps } from '../context';
 import type { SelectControlProps } from './types';
 import SelectControlChevronDown from './chevron-down';
 import { useDeprecated36pxDefaultSizeProp } from '../utils/use-deprecated-props';
+import { maybeWarnDeprecated36pxSize } from '../utils/deprecated-36px-size';
 
 function useUniqueId( idProp?: string ) {
 	const instanceId = useInstanceId( SelectControl );
@@ -65,6 +66,7 @@ function UnforwardedSelectControl< V extends string >(
 		variant = 'default',
 		__next40pxDefaultSize = false,
 		__nextHasNoMarginBottom = false,
+		__shouldNotWarnDeprecated36pxSize,
 		...restProps
 	} = useDeprecated36pxDefaultSizeProp( props );
 	const id = useUniqueId( idProp );
@@ -94,6 +96,13 @@ function UnforwardedSelectControl< V extends string >(
 
 	const classes = clsx( 'components-select-control', className );
 
+	maybeWarnDeprecated36pxSize( {
+		componentName: 'SelectControl',
+		__next40pxDefaultSize,
+		size,
+		__shouldNotWarnDeprecated36pxSize,
+	} );
+
 	return (
 		<BaseControl
 			help={ help }
@@ -154,6 +163,7 @@ function UnforwardedSelectControl< V extends string >(
  *
  *   return (
  *     <SelectControl
+ *       __next40pxDefaultSize
  *       __nextHasNoMarginBottom
  *       label="Size"
  *       value={ size }
diff --git a/packages/components/src/select-control/stories/index.story.tsx b/packages/components/src/select-control/stories/index.story.tsx
index d872df540602e..e9f7f09a1ddb0 100644
--- a/packages/components/src/select-control/stories/index.story.tsx
+++ b/packages/components/src/select-control/stories/index.story.tsx
@@ -65,6 +65,7 @@ const SelectControlWithState: StoryFn< typeof SelectControl > = ( props ) => {
 
 export const Default = SelectControlWithState.bind( {} );
 Default.args = {
+	__next40pxDefaultSize: true,
 	__nextHasNoMarginBottom: true,
 	label: 'Label',
 	options: [
@@ -87,6 +88,7 @@ WithLabelAndHelpText.args = {
  */
 export const WithCustomChildren = SelectControlWithState.bind( {} );
 WithCustomChildren.args = {
+	__next40pxDefaultSize: true,
 	__nextHasNoMarginBottom: true,
 	label: 'Label',
 	children: (
diff --git a/packages/components/src/select-control/test/select-control.tsx b/packages/components/src/select-control/test/select-control.tsx
index 47b684cd20e28..37935d60384b1 100644
--- a/packages/components/src/select-control/test/select-control.tsx
+++ b/packages/components/src/select-control/test/select-control.tsx
@@ -12,7 +12,13 @@ import _SelectControl from '..';
 const SelectControl = (
 	props: React.ComponentProps< typeof _SelectControl >
 ) => {
-	return <_SelectControl { ...props } __nextHasNoMarginBottom />;
+	return (
+		<_SelectControl
+			{ ...props }
+			__nextHasNoMarginBottom
+			__next40pxDefaultSize
+		/>
+	);
 };
 
 describe( 'SelectControl', () => {
diff --git a/packages/components/src/select-control/types.ts b/packages/components/src/select-control/types.ts
index 4e7211ab9abfb..3d9f06385c753 100644
--- a/packages/components/src/select-control/types.ts
+++ b/packages/components/src/select-control/types.ts
@@ -13,6 +13,7 @@ type SelectControlBaseProps< V extends string > = Pick<
 	InputBaseProps,
 	| '__next36pxDefaultSize'
 	| '__next40pxDefaultSize'
+	| '__shouldNotWarnDeprecated36pxSize'
 	| 'disabled'
 	| 'hideLabelFromVision'
 	| 'label'
diff --git a/packages/components/src/tree-select/index.tsx b/packages/components/src/tree-select/index.tsx
index bd92807bff4cc..075ae1268e3c7 100644
--- a/packages/components/src/tree-select/index.tsx
+++ b/packages/components/src/tree-select/index.tsx
@@ -102,6 +102,7 @@ export function TreeSelect( props: TreeSelectProps ) {
 	return (
 		<ContextSystemProvider value={ CONTEXT_VALUE }>
 			<SelectControl
+				__shouldNotWarnDeprecated36pxSize
 				{ ...{ label, options, onChange } }
 				value={ selectedId }
 				{ ...restProps }