diff --git a/packages/@react-aria/tag/src/useTagGroup.ts b/packages/@react-aria/tag/src/useTagGroup.ts
index 11b32c9508a..d8578594b7e 100644
--- a/packages/@react-aria/tag/src/useTagGroup.ts
+++ b/packages/@react-aria/tag/src/useTagGroup.ts
@@ -31,8 +31,11 @@ export interface TagGroupAria {
   errorMessageProps: DOMAttributes
 }
 
-export interface AriaTagGroupProps<T> extends CollectionBase<T>, MultipleSelection, Pick<AriaGridListProps<T>, 'escapeKeyBehavior'>, DOMProps, LabelableProps, AriaLabelingProps, Omit<HelpTextProps, 'errorMessage'> {
-  /** How multiple selection should behave in the collection. */
+export interface AriaTagGroupProps<T> extends CollectionBase<T>, MultipleSelection, Pick<AriaGridListProps<T>, 'escapeKeyBehavior' | 'onAction'>, DOMProps, LabelableProps, AriaLabelingProps, Omit<HelpTextProps, 'errorMessage'> {
+  /**
+   * How multiple selection should behave in the collection.
+   * @default 'toggle'
+   */
   selectionBehavior?: SelectionBehavior,
   /** Whether selection should occur on press up instead of press down. */
   shouldSelectOnPressUp?: boolean,
diff --git a/packages/@react-stately/selection/src/useMultipleSelectionState.ts b/packages/@react-stately/selection/src/useMultipleSelectionState.ts
index e58d0823850..f7893f47764 100644
--- a/packages/@react-stately/selection/src/useMultipleSelectionState.ts
+++ b/packages/@react-stately/selection/src/useMultipleSelectionState.ts
@@ -31,11 +31,17 @@ function equalSets(setA, setB) {
 }
 
 export interface MultipleSelectionStateProps extends MultipleSelection {
-  /** How multiple selection should behave in the collection. */
+  /**
+   * How multiple selection should behave in the collection.
+   * @default 'toggle'
+   */
   selectionBehavior?: SelectionBehavior,
   /** Whether onSelectionChange should fire even if the new set of keys is the same as the last. */
   allowDuplicateSelectionEvents?: boolean,
-  /** Whether `disabledKeys` applies to all interactions, or only selection. */
+  /**
+   * Whether `disabledKeys` applies to all interactions, or only selection.
+   * @default 'all'
+   */
   disabledBehavior?: DisabledBehavior
 }
 
diff --git a/packages/react-aria-components/test/TagGroup.test.js b/packages/react-aria-components/test/TagGroup.test.js
index adc4f07135b..94173ed3d73 100644
--- a/packages/react-aria-components/test/TagGroup.test.js
+++ b/packages/react-aria-components/test/TagGroup.test.js
@@ -521,6 +521,121 @@ describe('TagGroup', () => {
     expect(onRemove).toHaveBeenLastCalledWith(new Set(['dog']));
   });
 
+  it('should support onAction', async () => {
+    let onAction = jest.fn();
+    let {getAllByRole} = renderTagGroup({onAction, selectionMode: 'none'});
+    let items = getAllByRole('row');
+
+    await user.click(items[0]);
+    expect(onAction).toHaveBeenCalledTimes(1);
+    onAction.mockReset();
+
+    await user.keyboard('{Enter}');
+    expect(onAction).toHaveBeenCalledTimes(1);
+  });
+
+  it('should support onAction with selectionMode = single, behaviour = replace', async () => {
+    let onAction = jest.fn();
+    let {getAllByRole} = renderTagGroup({onAction, selectionMode: 'single', selectionBehavior: 'replace'});
+    let items = getAllByRole('row');
+
+    await user.dblClick(items[0]);
+    expect(onAction).toHaveBeenCalledTimes(1);
+    onAction.mockReset();
+
+    await user.click(items[1]);
+    expect(onAction).not.toHaveBeenCalled();
+    expect(items[1]).toHaveAttribute('aria-selected', 'true');
+
+    await user.dblClick(items[0]);
+    expect(onAction).toHaveBeenCalledTimes(1);
+    expect(items[0]).toHaveAttribute('aria-selected', 'false'); // should be true?
+    expect(items[1]).toHaveAttribute('aria-selected', 'false');
+    onAction.mockReset();
+
+    await user.keyboard('{Enter}');
+    expect(onAction).toHaveBeenCalledTimes(1);
+    expect(items[0]).toHaveAttribute('aria-selected', 'false'); // should be true?
+    expect(items[1]).toHaveAttribute('aria-selected', 'false');
+  });
+
+  it('should support onAction with selectionMode = multiple, behaviour = replace', async () => {
+    let onAction = jest.fn();
+    let {getAllByRole} = renderTagGroup({onAction, selectionMode: 'multiple', selectionBehavior: 'replace'});
+    let items = getAllByRole('row');
+
+    await user.dblClick(items[0]);
+    expect(onAction).toHaveBeenCalledTimes(1);
+    onAction.mockReset();
+
+    await user.click(items[1]);
+    expect(onAction).not.toHaveBeenCalled();
+    onAction.mockReset();
+    expect(items[1]).toHaveAttribute('aria-selected', 'true');
+
+    await user.dblClick(items[0]);
+    expect(onAction).toHaveBeenCalledTimes(1);
+    expect(items[0]).toHaveAttribute('aria-selected', 'true');
+    expect(items[1]).toHaveAttribute('aria-selected', 'false');
+    onAction.mockReset();
+
+    await user.keyboard('{Enter}');
+    expect(onAction).toHaveBeenCalledTimes(1);
+    expect(items[0]).toHaveAttribute('aria-selected', 'true');
+    expect(items[1]).toHaveAttribute('aria-selected', 'false');
+  });
+
+  // TODO: What do we want to do for this behaviour? Should we warn that it's not a valid combination? Or should it react to double click?
+  // Replace selectionBehavior works with double click, but toggle doesn't.
+  it.skip('should support onAction with selectionMode = single, behaviour = toggle', async () => {
+    let onAction = jest.fn();
+    let {getAllByRole} = renderTagGroup({onAction, selectionMode: 'single'});
+    let items = getAllByRole('row');
+
+    await user.dblClick(items[0]);
+    expect(onAction).toHaveBeenCalledTimes(1);
+    onAction.mockReset();
+
+    await user.click(items[1]);
+    expect(onAction).not.toHaveBeenCalled();
+    expect(items[1]).toHaveAttribute('aria-selected', 'true');
+
+    await user.dblClick(items[0]);
+    expect(onAction).toHaveBeenCalledTimes(1);
+    expect(items[0]).not.toHaveAttribute('aria-selected');
+    onAction.mockReset();
+
+    await user.keyboard('{Enter}');
+    expect(onAction).not.toHaveBeenCalled();
+    expect(items[0]).toHaveAttribute('aria-selected', 'true');
+    expect(items[1]).not.toHaveAttribute('aria-selected');
+  });
+
+  it.skip('should support onAction with selectionMode = multiple, behaviour = toggle', async () => {
+    let onAction = jest.fn();
+    let {getAllByRole} = renderTagGroup({onAction, selectionMode: 'multiple'});
+    let items = getAllByRole('row');
+
+    await user.dblClick(items[0]);
+    expect(onAction).toHaveBeenCalledTimes(1);
+    onAction.mockReset();
+
+    await user.click(items[1]);
+    expect(onAction).not.toHaveBeenCalled();
+    onAction.mockReset();
+    expect(items[1]).toHaveAttribute('aria-selected', 'true');
+
+    await user.dblClick(items[0]);
+    expect(onAction).toHaveBeenCalledTimes(1);
+    expect(items[0]).not.toHaveAttribute('aria-selected');
+    onAction.mockReset();
+
+    await user.keyboard('{Enter}');
+    expect(onAction).not.toHaveBeenCalled();
+    expect(items[0]).toHaveAttribute('aria-selected', 'true');
+    expect(items[1]).toHaveAttribute('aria-selected', 'true');
+  });
+
   describe('shouldSelectOnPressUp', () => {
     it('should select an item on pressing down when shouldSelectOnPressUp is not provided', async () => {
       let onSelectionChange = jest.fn();
@@ -560,7 +675,7 @@ describe('TagGroup', () => {
   });
 
   describe('press events', () => {
-    it.only.each`
+    it.each`
       interactionType
       ${'mouse'}
       ${'keyboard'}