diff --git a/pages/radio-group/style-api-v2.page.tsx b/pages/radio-group/style-api-v2.page.tsx
new file mode 100644
index 00000000000..0742a1dfa3f
--- /dev/null
+++ b/pages/radio-group/style-api-v2.page.tsx
@@ -0,0 +1,62 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+import React, { useState } from 'react';
+import clsx from 'clsx';
+
+import { RadioGroup, RadioGroupProps, SpaceBetween } from '~components';
+
+import { SimplePage } from '../app/templates';
+
+import styles from './style-api-v2.scss';
+
+const plans: RadioGroupProps.RadioButtonDefinition[] = [
+  { value: 'free', label: 'Free plan', description: 'For personal projects' },
+  { value: 'pro', label: 'Pro plan', description: 'Best for growing teams' },
+  { value: 'enterprise', label: 'Enterprise plan', description: 'Custom limits and support' },
+];
+
+const plansWithDisabled: RadioGroupProps.RadioButtonDefinition[] = [
+  plans[0],
+  plans[1],
+  { ...plans[2], disabled: true },
+];
+
+interface StyledRadioGroupProps {
+  ariaLabel: string;
+  items: RadioGroupProps.RadioButtonDefinition[];
+  readOnly?: boolean;
+  direction?: RadioGroupProps['direction'];
+}
+
+function StyledRadioGroup({ ariaLabel, items, readOnly, direction }: StyledRadioGroupProps) {
+  const [value, setValue] = useState('pro');
+  return (
+    <RadioGroup
+      ariaLabel={ariaLabel}
+      value={value}
+      items={items}
+      readOnly={readOnly}
+      direction={direction}
+      onChange={({ detail }) => setValue(detail.value)}
+      {...{
+        styleClassNames: {
+          radioButton: { control: clsx(styles['radio-control'], readOnly && styles['radio-control-readonly']) },
+        },
+      }}
+    />
+  );
+}
+
+export default function () {
+  return (
+    <SimplePage title="RadioGroup - Style API v2" screenshotArea={{}}>
+      <SpaceBetween size="l" direction="horizontal">
+        <StyledRadioGroup ariaLabel="Default" items={plansWithDisabled} />
+        <StyledRadioGroup ariaLabel="Read-only" items={plans} readOnly={true} />
+      </SpaceBetween>
+      <SpaceBetween size="l" direction="horizontal">
+        <StyledRadioGroup ariaLabel="Horizontal" items={plans} direction="horizontal" />
+      </SpaceBetween>
+    </SimplePage>
+  );
+}
diff --git a/pages/radio-group/style-api-v2.scss b/pages/radio-group/style-api-v2.scss
new file mode 100644
index 00000000000..73763209265
--- /dev/null
+++ b/pages/radio-group/style-api-v2.scss
@@ -0,0 +1,37 @@
+/*
+ Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ SPDX-License-Identifier: Apache-2.0
+*/
+
+@use '~components/styling/radio-button';
+@use '../style-api/palette' as palette;
+
+.radio-control {
+  @include radio-button.control(
+    $fill-color: palette.$control-bg,
+    $border-color: palette.$border-accent,
+    $focus-ring-color: palette.$accent,
+    $focus-ring-width: 3px,
+    $focus-ring-radius: 50%
+  );
+
+  &:has(:checked) {
+    @include radio-button.control($fill-color: palette.$control-bg-checked, $indicator-color: palette.$control-fg);
+  }
+
+  &:has(:disabled) {
+    @include radio-button.control(
+      $fill-color: palette.$control-bg-disabled,
+      $border-color: palette.$border-disabled,
+      $indicator-color: palette.$control-fg-disabled
+    );
+  }
+
+  &.radio-control-readonly {
+    @include radio-button.control(
+      $fill-color: palette.$surface-alt,
+      $border-color: palette.$border,
+      $indicator-color: palette.$text-muted
+    );
+  }
+}
diff --git a/src/internal/components/radio-button/index.tsx b/src/internal/components/radio-button/index.tsx
index b8205a3d371..72b02e836bb 100644
--- a/src/internal/components/radio-button/index.tsx
+++ b/src/internal/components/radio-button/index.tsx
@@ -24,7 +24,7 @@ export interface InternalRadioButtonProps extends RadioButtonProps, InternalBase
 }
 
 // Style API v2
-interface StyleClassNames {
+export interface StyleClassNames {
   control?: string;
 }
 
diff --git a/src/internal/components/radio-button/styles.scss b/src/internal/components/radio-button/styles.scss
index 9c7968c5acd..237df35501e 100644
--- a/src/internal/components/radio-button/styles.scss
+++ b/src/internal/components/radio-button/styles.scss
@@ -14,6 +14,8 @@ $radio-size: awsui.$size-control;
 
 $_control-props: style-api.combine((fill-color, border-color, indicator-color), style-api.$focus-ring);
 $_control-tokens: style-api.resolve($_control-props, carrier);
+// Registered here, next to the carrier, so every component that renders this control loads the registration.
+@include style-api.register($_control-tokens);
 
 .radio-control {
   @include style-api.carriers($_control-tokens);
diff --git a/src/radio-button/styles.scss b/src/radio-button/styles.scss
index 7234d46ed5b..1f0da938032 100644
--- a/src/radio-button/styles.scss
+++ b/src/radio-button/styles.scss
@@ -6,10 +6,9 @@
 @use '../internal/styles' as styles;
 @use '../internal/styles/style-api' as style-api;
 
-// The control slot is painted by the shared internal radio button, which reads the same token map.
+// The control slot is painted by the shared internal radio button, which reads the same token map and registers it.
 $control-props: style-api.combine((fill-color, border-color, indicator-color), style-api.$focus-ring);
 $control-tokens: style-api.resolve($control-props, carrier);
-@include style-api.register($control-tokens);
 @include style-api.docs('control', $control-tokens);
 
 .radio-button {
diff --git a/src/radio-group/__tests__/style-api.test.tsx b/src/radio-group/__tests__/style-api.test.tsx
new file mode 100644
index 00000000000..5c6a74a8827
--- /dev/null
+++ b/src/radio-group/__tests__/style-api.test.tsx
@@ -0,0 +1,35 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+import React from 'react';
+import { render } from '@testing-library/react';
+
+import RadioGroup, { RadioGroupProps } from '../../../lib/components/radio-group';
+import createWrapper from '../../../lib/components/test-utils/dom';
+
+const items: RadioGroupProps.RadioButtonDefinition[] = [
+  { value: 'free', label: 'Free plan' },
+  { value: 'pro', label: 'Pro plan' },
+  { value: 'enterprise', label: 'Enterprise plan', disabled: true },
+];
+
+function renderRadioGroup(styleClassNames: Record<string, unknown>) {
+  const { container } = render(<RadioGroup ariaLabel="Plan" value="pro" items={items} {...{ styleClassNames }} />);
+  return { container, wrapper: createWrapper(container).findRadioGroup()! };
+}
+
+describe('RadioGroup Style API v2', () => {
+  test('forwards the radio button classes to every radio', () => {
+    const { container, wrapper } = renderRadioGroup({ radioButton: { control: 'a', unknown: 'b' }, unknown: 'c' });
+    const buttons = wrapper.findButtons();
+    expect(buttons).toHaveLength(3);
+    for (const button of buttons) {
+      expect(button.findNativeInput().getElement().parentElement).toHaveClass('a');
+    }
+    expect(container.querySelector('.b, .c')).toBeNull();
+  });
+
+  test('does not leak the styleClassNames prop to the DOM', () => {
+    const { container } = renderRadioGroup({ radioButton: { control: 'a' } });
+    expect(container.querySelector('[styleClassNames]')).toBeNull();
+  });
+});
diff --git a/src/radio-group/internal.tsx b/src/radio-group/internal.tsx
index d0011fef7a9..104424eee6a 100644
--- a/src/radio-group/internal.tsx
+++ b/src/radio-group/internal.tsx
@@ -7,7 +7,7 @@ import { useUniqueId } from '@cloudscape-design/component-toolkit/internal';
 import { getAnalyticsMetadataAttribute } from '@cloudscape-design/component-toolkit/internal/analytics-metadata';
 
 import { getBaseProps } from '../internal/base-component';
-import RadioButton from '../internal/components/radio-button';
+import RadioButton, { StyleClassNames as RadioButtonStyleClassNames } from '../internal/components/radio-button';
 import { useFormFieldContext } from '../internal/context/form-field-context';
 import { fireNonCancelableEvent } from '../internal/events';
 import useRadioGroupForwardFocus from '../internal/hooks/forward-focus/radio-group';
@@ -19,7 +19,15 @@ import analyticsSelectors from './analytics-metadata/styles.css.js';
 import styles from './styles.css.js';
 import testUtilStyles from './test-classes/styles.css.js';
 
-type InternalRadioGroupProps = RadioGroupProps & InternalBaseComponentProps;
+type InternalRadioGroupProps = RadioGroupProps &
+  InternalBaseComponentProps & {
+    styleClassNames?: StyleClassNames;
+  };
+
+// Style API v2
+export interface StyleClassNames {
+  radioButton?: RadioButtonStyleClassNames;
+}
 
 const InternalRadioGroup = React.forwardRef(
   (
@@ -35,6 +43,7 @@ const InternalRadioGroup = React.forwardRef(
       __internalRootRef,
       style,
       direction,
+      styleClassNames,
       ...props
     }: InternalRadioGroupProps,
     ref: React.Ref<RadioGroupProps.Ref>
@@ -83,6 +92,7 @@ const InternalRadioGroup = React.forwardRef(
               controlId={item.controlId}
               readOnly={readOnly}
               style={style}
+              styleClassNames={styleClassNames?.radioButton}
               {...getAnalyticsMetadataAttribute(
                 !item.disabled && !readOnly
                   ? {
diff --git a/src/radio-group/styles.scss b/src/radio-group/styles.scss
index cdf6994923e..7edc284ff25 100644
--- a/src/radio-group/styles.scss
+++ b/src/radio-group/styles.scss
@@ -5,6 +5,9 @@
 
 @use '../internal/styles' as styles;
 @use '../internal/styles/tokens' as awsui;
+@use '../internal/styles/style-api' as style-api;
+
+@include style-api.docs-forward('radioButton', 'radio-button');
 
 .radio-group {
   @include styles.styles-reset;