diff --git a/packages/components/CHANGELOG.md b/packages/components/CHANGELOG.md
index 81ced7373fe2df..5c43f778a1d8ee 100644
--- a/packages/components/CHANGELOG.md
+++ b/packages/components/CHANGELOG.md
@@ -20,6 +20,7 @@
 -    The `Button` component now displays the label as the tooltip for icon only buttons. ([#40716](https://github.com/WordPress/gutenberg/pull/40716))
 -    Use fake timers and fix usage of async methods from `@testing-library/user-event`. ([#40790](https://github.com/WordPress/gutenberg/pull/40790))
 -    UnitControl: avoid calling onChange callback twice when unit changes. ([#40796](https://github.com/WordPress/gutenberg/pull/40796))
+-    `UnitControl`: show unit label when units prop has only one unit. ([#40784](https://github.com/WordPress/gutenberg/pull/40784))
 -    `AnglePickerControl`: Fix closing of gradient popover when the angle control is clicked. ([#40735](https://github.com/WordPress/gutenberg/pull/40735))
 
 ### Internal
diff --git a/packages/components/src/unit-control/index.tsx b/packages/components/src/unit-control/index.tsx
index 3296438b04b8c4..440dc11b94e8b9 100644
--- a/packages/components/src/unit-control/index.tsx
+++ b/packages/components/src/unit-control/index.tsx
@@ -88,7 +88,7 @@ function UnforwardedUnitControl(
 	);
 
 	const [ unit, setUnit ] = useControlledState< string | undefined >(
-		unitProp,
+		units.length === 1 ? units[ 0 ].value : unitProp,
 		{
 			initial: parsedUnit,
 			fallback: '',
diff --git a/packages/components/src/unit-control/stories/index.tsx b/packages/components/src/unit-control/stories/index.tsx
index 5fdace14370ea6..87dfd3a84c602d 100644
--- a/packages/components/src/unit-control/stories/index.tsx
+++ b/packages/components/src/unit-control/stories/index.tsx
@@ -109,40 +109,10 @@ TweakingTheNumberInput.args = {
 /**
  * When only one unit is available, the unit selection dropdown becomes static text.
  */
-export const WithSingleUnitControlled: ComponentStory<
+export const WithSingleUnit: ComponentStory<
 	typeof UnitControl
-> = ( { onChange, ...args } ) => {
-	// Starting value is `undefined`
-	const [ value, setValue ] = useState< string | undefined >( undefined );
-
-	return (
-		<div style={ { maxWidth: '100px' } }>
-			<UnitControl
-				{ ...args }
-				value={ value }
-				onChange={ ( v, extra ) => {
-					setValue( v );
-					onChange?.( v, extra );
-				} }
-			/>
-		</div>
-	);
-};
-WithSingleUnitControlled.args = {
-	...Default.args,
-	units: CSS_UNITS.slice( 0, 1 ),
-};
-
-export const WithSingleUnitUncontrolled: ComponentStory<
-	typeof UnitControl
-> = ( args ) => {
-	return (
-		<div style={ { maxWidth: '100px' } }>
-			<UnitControl { ...args } />
-		</div>
-	);
-};
-WithSingleUnitUncontrolled.args = {
+> = DefaultTemplate.bind( {} );
+WithSingleUnit.args = {
 	...Default.args,
 	units: CSS_UNITS.slice( 0, 1 ),
 };
diff --git a/packages/components/src/unit-control/test/index.tsx b/packages/components/src/unit-control/test/index.tsx
index c57af0e75a7379..7c0f4ed99048d2 100644
--- a/packages/components/src/unit-control/test/index.tsx
+++ b/packages/components/src/unit-control/test/index.tsx
@@ -135,12 +135,7 @@ describe( 'UnitControl', () => {
 		} );
 
 		it( 'should render label if single units', () => {
-			render(
-				<UnitControl
-					units={ [ { value: '%', label: '%' } ] }
-					value="30%"
-				/>
-			);
+			render( <UnitControl units={ [ { value: '%', label: '%' } ] } /> );
 
 			const select = screen.queryByRole( 'combobox' );
 			const label = screen.getByText( '%' );
@@ -319,6 +314,36 @@ describe( 'UnitControl', () => {
 				expect.anything()
 			);
 		} );
+
+		it( 'should update value correctly when typed and blurred when a single unit is passed', async () => {
+			const onChangeSpy = jest.fn();
+			render(
+				<>
+					<button>Click me</button>
+					<UnitControl
+						units={ [ { value: '%', label: '%' } ] }
+						onChange={ onChangeSpy }
+					/>
+				</>
+			);
+
+			const input = getInput();
+			await user.type( input, '62' );
+
+			expect( onChangeSpy ).toHaveBeenLastCalledWith(
+				'62%',
+				expect.anything()
+			);
+
+			// Start counting again calls to `onChangeSpy`.
+			onChangeSpy.mockClear();
+
+			// Clicking on the button should cause the `onBlur` callback to fire.
+			const button = screen.getByRole( 'button' );
+			await user.click( button );
+
+			expect( onChangeSpy ).not.toHaveBeenCalled();
+		} );
 	} );
 
 	describe( 'Unit', () => {