diff --git a/packages/design-system-react-native/CHANGELOG.md b/packages/design-system-react-native/CHANGELOG.md
--- a/packages/design-system-react-native/CHANGELOG.md
+++ b/packages/design-system-react-native/CHANGELOG.md
@@ -7,6 +7,10 @@
 
 ## [Unreleased]
 
+### Changed
+
+- **BREAKING:** Simplified `BannerBase` close-button handling so `onClose` is the only behavioral close API; `closeButtonProps` now customizes the close `ButtonIcon` only and no longer accepts `onPress`. The close button is rendered only when `onClose` is provided. See [Migration Guide](./MIGRATION.md#from-version-0230-to-0x0).
+
 ## [0.23.0]
 
 ### Added

diff --git a/packages/design-system-react-native/MIGRATION.md b/packages/design-system-react-native/MIGRATION.md
--- a/packages/design-system-react-native/MIGRATION.md
+++ b/packages/design-system-react-native/MIGRATION.md
@@ -27,6 +27,7 @@
   - [TabEmptyState Component](#tabemptystate-component)
   - [Toast Component](#toast-component)
 - [Version Updates](#version-updates)
+  - [From version 0.23.0 to 0.x.0](#from-version-0230-to-0x0)
   - [From version 0.22.0 to 0.23.0](#from-version-0220-to-0230)
   - [From version 0.21.0 to 0.22.0](#from-version-0210-to-0220)
   - [From version 0.19.0 to 0.20.0](#from-version-0190-to-0200)
@@ -41,6 +42,28 @@
 
 ## Version Updates
 
+<!-- TODO: Replace 0.x.0 with the actual next released version when this BannerBase follow-up ships. -->
+
+### From version 0.23.0 to 0.x.0
+
+#### BannerBase: `onClose` is now the only close-button behavior API
+
+**What changed:**
+
+- **`closeButtonProps.onPress`** is removed from the public **`BannerBase`** API.
+- The close button now renders **only** when **`onClose`** is provided.
+- **`closeButtonProps`** is now customization-only for the rendered close **`ButtonIcon`**.
+
+**Migration:**
+
+- Move any close-button behavior from **`closeButtonProps.onPress`** to **`onClose`**.
+- Keep **`closeButtonProps`** only for non-behavioral customization such as **`testID`**, accessibility props, and styling hooks.
+- If you previously passed only **`closeButtonProps`** to force-render a close button, also provide **`onClose`** now.
+
+**Impact:**
+
+- Existing **`@metamask/design-system-react-native`** consumers that relied on **`closeButtonProps.onPress`** or on rendering a close button without **`onClose`** must update those call sites.
+
 ### From version 0.22.0 to 0.23.0
 
 #### Toast: static API replaces context-based usage
@@ -2099,21 +2122,21 @@
 
 ##### Renamed Props
 
-| Legacy Mobile API                            | MMDS API                                     |
-| -------------------------------------------- | -------------------------------------------- |
-| `actionButtonProps.onPress`                  | `actionButtonOnPress`                        |
-| `actionButtonProps.label`                    | `actionButtonLabel`                          |
-| `closeButtonProps.onPress` (still supported) | `closeButtonProps.onPress` (still supported) |
+| Legacy Mobile API           | MMDS API              |
+| --------------------------- | --------------------- |
+| `actionButtonProps.onPress` | `actionButtonOnPress` |
+| `actionButtonProps.label`   | `actionButtonLabel`   |
+| `closeButtonProps.onPress`  | **`onClose`**         |
 
 ##### Type and Callback Signature Changes
 
-| Legacy Mobile API                                       | MMDS API                                                                                                                            | Notes                                                                        |
-| ------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------- |
-| `actionButtonProps?: ButtonProps`                       | `actionButtonProps?: Omit<Partial<ButtonProps>, 'children' \| 'onPress' \| 'variant'>`                                              | MMDS prevents setting action handler and variant through `actionButtonProps` |
-| `actionButtonProps` controls rendering of action button | `actionButtonOnPress` controls rendering of action button                                                                           | Action button is shown only when `actionButtonOnPress` is provided           |
-| `title?: string \| React.ReactNode`                     | `title?: ReactNode`                                                                                                                 | Equivalent content support                                                   |
-| `description?: string \| React.ReactNode`               | `description?: ReactNode`                                                                                                           | Equivalent content support                                                   |
-| `closeButtonProps?: ButtonIconProps`                    | `closeButtonProps?: Omit<Partial<ButtonIconProps>, 'iconName' \| 'onPress'> & { onPress?: (event: GestureResponderEvent) => void }` | `iconName` remains fixed to close icon                                       |
+| Legacy Mobile API                                       | MMDS API                                                                               | Notes                                                                        |
+| ------------------------------------------------------- | -------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------- |
+| `actionButtonProps?: ButtonProps`                       | `actionButtonProps?: Omit<Partial<ButtonProps>, 'children' \| 'onPress' \| 'variant'>` | MMDS prevents setting action handler and variant through `actionButtonProps` |
+| `actionButtonProps` controls rendering of action button | `actionButtonOnPress` controls rendering of action button                              | Action button is shown only when `actionButtonOnPress` is provided           |
+| `title?: string \| React.ReactNode`                     | `title?: ReactNode`                                                                    | Equivalent content support                                                   |
+| `description?: string \| React.ReactNode`               | `description?: ReactNode`                                                              | Equivalent content support                                                   |
+| `closeButtonProps?: ButtonIconProps`                    | `closeButtonProps?: Omit<Partial<ButtonIconProps>, 'iconName' \| 'onPress'>`           | `iconName` remains fixed to close icon; use `onClose` for behavior           |
 
 ##### Default and Behavior Changes
 
@@ -2121,7 +2144,7 @@
 | ------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------ |
 | Action button shown when `actionButtonProps` exists                      | Action button shown when `actionButtonOnPress` exists                                                              |
 | Action button defaults to `size={ButtonSize.Auto}`                       | Action button defaults to `size={ButtonSize.Md}`                                                                   |
-| Close button press fallback uses `noop` when callbacks are missing       | Close button callback is omitted when callbacks are missing                                                        |
+| Close button press fallback uses `noop` when callbacks are missing       | Close button is rendered only when `onClose` is provided                                                           |
 | Close button icon default color is `IconColor.Default`                   | MMDS `BannerBase` delegates icon color to `ButtonIcon` defaults unless explicitly overridden in `closeButtonProps` |
 | Close button accessibility label had no explicit default in `BannerBase` | Default close label is `'Close banner'` (override with `closeButtonProps.accessibilityLabel`)                      |
 

diff --git a/packages/design-system-react-native/src/components/BannerBase/BannerBase.stories.tsx b/packages/design-system-react-native/src/components/BannerBase/BannerBase.stories.tsx
--- a/packages/design-system-react-native/src/components/BannerBase/BannerBase.stories.tsx
+++ b/packages/design-system-react-native/src/components/BannerBase/BannerBase.stories.tsx
@@ -41,7 +41,8 @@
     },
     closeButtonProps: {
       control: 'object',
-      description: 'Optional props for the close button',
+      description:
+        'Optional non-behavioral props for the close button when onClose is provided',
     },
     startAccessory: {
       control: false,

diff --git a/packages/design-system-react-native/src/components/BannerBase/BannerBase.test.tsx b/packages/design-system-react-native/src/components/BannerBase/BannerBase.test.tsx
--- a/packages/design-system-react-native/src/components/BannerBase/BannerBase.test.tsx
+++ b/packages/design-system-react-native/src/components/BannerBase/BannerBase.test.tsx
@@ -97,12 +97,10 @@
     );
   });
 
-  it('renders close button and triggers closeButtonProps.onPress when onClose is not provided', () => {
-    const onCloseButtonPress = jest.fn();
-    const { getByTestId } = render(
+  it('does not render close button when only closeButtonProps are provided', () => {
+    const { queryByTestId } = render(
       <BannerBase
         closeButtonProps={{
-          onPress: onCloseButtonPress,
           accessibilityLabel: 'Dismiss banner',
           testID: closeButtonTestId,
           twClassName: 'p-2',
@@ -110,10 +108,6 @@
       />,
     );
 
-    expect(getByTestId(closeButtonTestId).props.accessibilityLabel).toBe(
-      'Dismiss banner',
-    );
-    fireEvent.press(getByTestId(closeButtonTestId));
-    expect(onCloseButtonPress).toHaveBeenCalledTimes(1);
+    expect(queryByTestId(closeButtonTestId)).toBeNull();
   });
 });

diff --git a/packages/design-system-react-native/src/components/BannerBase/BannerBase.tsx b/packages/design-system-react-native/src/components/BannerBase/BannerBase.tsx
--- a/packages/design-system-react-native/src/components/BannerBase/BannerBase.tsx
+++ b/packages/design-system-react-native/src/components/BannerBase/BannerBase.tsx
@@ -9,7 +9,6 @@
   TextVariant,
 } from '@metamask/design-system-shared';
 import React from 'react';
-import { GestureResponderEvent } from 'react-native';
 
 import { Box } from '../Box';
 import { Button } from '../Button';
@@ -44,25 +43,13 @@
 
   const {
     accessibilityLabel: closeButtonAccessibilityLabel = 'Close banner',
-    onPress: closeButtonPropsOnPress,
     twClassName: closeButtonTwClassName,
     ...resolvedCloseButtonProps
   } = closeButtonProps ?? {};
 
-  const shouldShowCloseButton = Boolean(onClose || closeButtonProps);
+  const shouldShowCloseButton = Boolean(onClose);
   const shouldShowActionButton = Boolean(actionButtonOnPress);
 
-  const handleClosePress =
-    onClose || closeButtonPropsOnPress
-      ? (event: GestureResponderEvent) => {
-          if (onClose) {
-            onClose();
-            return;
-          }
-          closeButtonPropsOnPress?.(event);
-        }
-      : undefined;
-
   const mergedCloseButtonTwClassName = closeButtonTwClassName
     ? `ml-3 ${closeButtonTwClassName}`
     : 'ml-3';
@@ -133,8 +120,8 @@
           iconName={IconName.Close}
           size={ButtonIconSize.Sm}
           accessibilityLabel={closeButtonAccessibilityLabel}
-          onPress={handleClosePress}
           {...resolvedCloseButtonProps}
+          onPress={onClose}
         />
       )}
     </Box>

diff --git a/packages/design-system-react-native/src/components/BannerBase/BannerBase.types.ts b/packages/design-system-react-native/src/components/BannerBase/BannerBase.types.ts
--- a/packages/design-system-react-native/src/components/BannerBase/BannerBase.types.ts
+++ b/packages/design-system-react-native/src/components/BannerBase/BannerBase.types.ts
@@ -14,12 +14,7 @@
 type BannerBaseCloseButtonProps = Omit<
   Partial<ButtonIconProps>,
   'iconName' | 'onPress'
-> & {
-  /**
-   * Optional press handler for the close button.
-   */
-  onPress?: (event: GestureResponderEvent) => void;
-};
+>;
 
 type BannerBasePropsBase = BannerBasePropsShared &
   Omit<BoxProps, 'children'> & {
@@ -42,7 +37,7 @@
     onClose?: () => void;
     /**
      * Optional props for the close `ButtonIcon`.
-     * Providing this also shows a close button.
+     * Only used when `onClose` is provided.
      */
     closeButtonProps?: BannerBaseCloseButtonProps;
   };

diff --git a/packages/design-system-react-native/src/components/BannerBase/README.md b/packages/design-system-react-native/src/components/BannerBase/README.md
--- a/packages/design-system-react-native/src/components/BannerBase/README.md
+++ b/packages/design-system-react-native/src/components/BannerBase/README.md
@@ -95,12 +95,12 @@
 
 ### `onClose`
 
-Optional close callback. If passed, a close button is shown. Use `closeButtonProps` to pass additional props to the close `ButtonIcon`, including `testID` when needed for testing.
+Optional close callback. If passed, a close button is shown. Use `closeButtonProps` to pass additional non-behavioral props to the close `ButtonIcon`, including `testID`, accessibility props, and styling hooks when needed for testing.
 
-| PROP               | TYPE                                                                                                             | REQUIRED | DEFAULT     |
-| ------------------ | ---------------------------------------------------------------------------------------------------------------- | -------- | ----------- |
-| `onClose`          | `() => void`                                                                                                     | No       | `undefined` |
-| `closeButtonProps` | `Omit<Partial<ButtonIconProps>, 'iconName' \| 'onPress'> & { onPress?: (event: GestureResponderEvent) => void }` | No       | `undefined` |
+| PROP               | TYPE                                                      | REQUIRED | DEFAULT     |
+| ------------------ | --------------------------------------------------------- | -------- | ----------- |
+| `onClose`          | `() => void`                                              | No       | `undefined` |
+| `closeButtonProps` | `Omit<Partial<ButtonIconProps>, 'iconName' \| 'onPress'>` | No       | `undefined` |
 
 ```tsx
 <BannerBase