diff --git a/packages/@adobe/react-spectrum/src/dialog/AlertDialog.tsx b/packages/@adobe/react-spectrum/src/dialog/AlertDialog.tsx
index 9583141f1e9..2f2d89b0e7e 100644
--- a/packages/@adobe/react-spectrum/src/dialog/AlertDialog.tsx
+++ b/packages/@adobe/react-spectrum/src/dialog/AlertDialog.tsx
@@ -11,6 +11,7 @@
  */
 
 import AlertMedium from '@spectrum-icons/ui/AlertMedium';
+import {AriaLabelingProps, DOMProps, DOMRef, StyleProps} from '@react-types/shared';
 import {Button, SpectrumButtonProps} from '../button/Button';
 import {ButtonGroup} from '../buttongroup/ButtonGroup';
 import {chain} from 'react-aria/chain';
@@ -19,7 +20,6 @@ import {Content} from '../view/Content';
 import {Dialog} from './Dialog';
 import {DialogContext, DialogContextValue} from './context';
 import {Divider} from '../divider/Divider';
-import {DOMProps, DOMRef, StyleProps} from '@react-types/shared';
 import {filterDOMProps} from 'react-aria/filterDOMProps';
 import {Heading} from '../text/Heading';
 import intlMessages from '../../intl/dialog/*.json';
@@ -29,7 +29,7 @@ import styles from '@adobe/spectrum-css-temp/components/dialog/vars.css';
 import {useLocalizedStringFormatter} from 'react-aria/useLocalizedStringFormatter';
 import {useStyleProps} from '../utils/styleProps';
 
-export interface SpectrumAlertDialogProps extends DOMProps, StyleProps {
+export interface SpectrumAlertDialogProps extends AriaLabelingProps, DOMProps, StyleProps {
   /** The [visual style](https://spectrum.adobe.com/page/alert-dialog/#Options) of the AlertDialog.  */
   variant?: 'confirmation' | 'information' | 'destructive' | 'error' | 'warning';
   /** The title of the AlertDialog. */
@@ -105,7 +105,7 @@ export const AlertDialog = forwardRef(function AlertDialog(
       size="M"
       role="alertdialog"
       ref={ref}
-      {...filterDOMProps(props)}>
+      {...filterDOMProps(props, {labelable: true})}>
       <Heading>{title}</Heading>
       {(variant === 'error' || variant === 'warning') && (
         <AlertMedium slot="typeIcon" aria-label={stringFormatter.format('alert')} />
diff --git a/packages/@adobe/react-spectrum/src/dialog/Dialog.tsx b/packages/@adobe/react-spectrum/src/dialog/Dialog.tsx
index 5ac767085cd..b115addc2ee 100644
--- a/packages/@adobe/react-spectrum/src/dialog/Dialog.tsx
+++ b/packages/@adobe/react-spectrum/src/dialog/Dialog.tsx
@@ -70,7 +70,7 @@ export const Dialog = React.forwardRef(function Dialog(props: SpectrumDialogProp
   let domRef = useDOMRef(ref);
   let gridRef = useRef(null);
   let sizeVariant = sizeMap[type] || sizeMap[size];
-  let {dialogProps, titleProps} = useDialog(mergeProps(contextProps, props), domRef);
+  let {dialogProps, titleProps, contentProps} = useDialog(mergeProps(contextProps, props), domRef);
 
   let hasHeader = useHasChild(`.${styles['spectrum-Dialog-header']}`, unwrapDOMRef(gridRef));
   let hasHeading = useHasChild(`.${styles['spectrum-Dialog-heading']}`, unwrapDOMRef(gridRef));
@@ -96,7 +96,7 @@ export const Dialog = React.forwardRef(function Dialog(props: SpectrumDialogProp
       },
       typeIcon: {UNSAFE_className: styles['spectrum-Dialog-typeIcon']},
       divider: {UNSAFE_className: styles['spectrum-Dialog-divider'], size: 'M'},
-      content: {UNSAFE_className: styles['spectrum-Dialog-content']},
+      content: {UNSAFE_className: styles['spectrum-Dialog-content'], ...contentProps},
       footer: {UNSAFE_className: styles['spectrum-Dialog-footer']},
       buttonGroup: {
         UNSAFE_className: classNames(styles, 'spectrum-Dialog-buttonGroup', {
@@ -106,7 +106,7 @@ export const Dialog = React.forwardRef(function Dialog(props: SpectrumDialogProp
       }
       // eslint-disable-next-line react-hooks/exhaustive-deps
     }),
-    [hasFooter, hasHeader, titleProps]
+    [hasFooter, hasHeader, titleProps, contentProps]
   );
 
   return (
diff --git a/packages/@adobe/react-spectrum/test/dialog/AlertDialog.test.js b/packages/@adobe/react-spectrum/test/dialog/AlertDialog.test.js
index 9a85f56405a..0c840198996 100644
--- a/packages/@adobe/react-spectrum/test/dialog/AlertDialog.test.js
+++ b/packages/@adobe/react-spectrum/test/dialog/AlertDialog.test.js
@@ -246,4 +246,37 @@ describe('AlertDialog', function () {
     let primaryBtn = getByTestId('rsp-AlertDialog-confirmButton');
     expect(primaryBtn).toBeDefined();
   });
+
+  it('should have aria-describedby pointing to the content', function () {
+    let {getByRole} = render(
+      <Provider theme={theme}>
+        <AlertDialog variant="confirmation" title="the title" primaryActionLabel="confirm">
+          Content body
+        </AlertDialog>
+      </Provider>
+    );
+
+    let dialog = getByRole('alertdialog');
+    expect(dialog).toHaveAttribute('aria-describedby');
+    let contentId = dialog.getAttribute('aria-describedby');
+    let content = document.getElementById(contentId);
+    expect(content).not.toBeNull();
+    expect(content.textContent).toBe('Content body');
+  });
+
+  it('accepts custom aria-describedby', function () {
+    let {getByRole} = render(
+      <Provider theme={theme}>
+        <AlertDialog
+          aria-describedby="content-id"
+          variant="confirmation"
+          title="the title"
+          primaryActionLabel="confirm">
+          Content body
+        </AlertDialog>
+      </Provider>
+    );
+
+    expect(getByRole('alertdialog')).toHaveAttribute('aria-describedby', 'content-id');
+  });
 });
diff --git a/packages/@react-spectrum/s2/src/AlertDialog.tsx b/packages/@react-spectrum/s2/src/AlertDialog.tsx
index 94237308ae4..10f08ea40c3 100644
--- a/packages/@react-spectrum/s2/src/AlertDialog.tsx
+++ b/packages/@react-spectrum/s2/src/AlertDialog.tsx
@@ -11,13 +11,14 @@
  */
 
 import AlertTriangle from '../s2wf-icons/S2_Icon_AlertTriangle_20_N.svg';
+import {AriaLabelingProps, DOMProps, DOMRef} from '@react-types/shared';
 import {Button} from './Button';
 import {ButtonGroup} from './ButtonGroup';
 import {CenterBaseline} from './CenterBaseline';
 import {chain} from 'react-aria/chain';
 import {Content, Heading} from './Content';
 import {Dialog} from './Dialog';
-import {DOMProps, DOMRef} from '@react-types/shared';
+import {filterDOMProps} from 'react-aria/filterDOMProps';
 import {forwardRef, ReactNode} from 'react';
 import {IconContext} from './Icon';
 // @ts-ignore
@@ -28,7 +29,7 @@ import {style} from '../style' with {type: 'macro'};
 import {UnsafeStyles} from './style-utils' with {type: 'macro'};
 import {useLocalizedStringFormatter} from 'react-aria/useLocalizedStringFormatter';
 
-export interface AlertDialogProps extends DOMProps, UnsafeStyles {
+export interface AlertDialogProps extends AriaLabelingProps, DOMProps, UnsafeStyles {
   /**
    * The [visual style](https://spectrum.adobe.com/page/alert-dialog/#Options) of the AlertDialog.
    * @default 'confirmation'
@@ -104,8 +105,11 @@ export const AlertDialog = forwardRef(function AlertDialog(props: AlertDialogPro
     buttonVariant = 'negative';
   }
 
+  let domProps = filterDOMProps(props, {labelable: true});
+
   return (
     <Dialog
+      {...domProps}
       role="alertdialog"
       ref={ref}
       size={props.size}
diff --git a/packages/@react-spectrum/s2/src/Dialog.tsx b/packages/@react-spectrum/s2/src/Dialog.tsx
index 93689106425..39e4cb0a00f 100644
--- a/packages/@react-spectrum/s2/src/Dialog.tsx
+++ b/packages/@react-spectrum/s2/src/Dialog.tsx
@@ -24,6 +24,7 @@ import {
   DialogProps as RACDialogProps
 } from 'react-aria-components/Dialog';
 import {Provider} from 'react-aria-components/slots';
+import {TextContext as RACTextContext} from 'react-aria-components/Text';
 import {style} from '../style' with {type: 'macro'};
 import {StyleProps} from './style-utils';
 import {useDOMRef} from './useDOMRef';
@@ -196,17 +197,27 @@ export const Dialog = forwardRef(function Dialog(props: DialogProps, ref: DOMRef
               {props.isDismissible && <CloseButton styles={style({marginBottom: 12})} />}
             </div>
             {/* Main content */}
-            <Provider
-              values={[
-                [ImageContext, {hidden: true}],
-                [HeadingContext, {isHidden: true}],
-                [HeaderContext, {isHidden: true}],
-                [ContentContext, {styles: content}],
-                [FooterContext, {isHidden: true}],
-                [ButtonGroupContext, {isHidden: true}]
-              ]}>
-              {children}
-            </Provider>
+            <RACTextContext.Consumer>
+              {value => {
+                let contentValue = {};
+                if (value && 'slots' in value && value.slots?.description) {
+                  contentValue = value.slots.description;
+                }
+                return (
+                  <Provider
+                    values={[
+                      [ImageContext, {hidden: true}],
+                      [HeadingContext, {isHidden: true}],
+                      [HeaderContext, {isHidden: true}],
+                      [ContentContext, {styles: content, ...contentValue}],
+                      [FooterContext, {isHidden: true}],
+                      [ButtonGroupContext, {isHidden: true}]
+                    ]}>
+                    {children}
+                  </Provider>
+                );
+              }}
+            </RACTextContext.Consumer>
             {/* Footer and button group */}
             <div
               className={style({
diff --git a/packages/@react-spectrum/s2/test/AlertDialog.test.tsx b/packages/@react-spectrum/s2/test/AlertDialog.test.tsx
new file mode 100644
index 00000000000..06a8f2d3fb8
--- /dev/null
+++ b/packages/@react-spectrum/s2/test/AlertDialog.test.tsx
@@ -0,0 +1,85 @@
+/*
+ * Copyright 2025 Adobe. All rights reserved.
+ * This file is licensed to you under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License. You may obtain a copy
+ * of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under
+ * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
+ * OF ANY KIND, either express or implied. See the License for the specific language
+ * governing permissions and limitations under the License.
+ */
+
+import {act, pointerMap, render} from '@react-spectrum/test-utils-internal';
+import {ActionButton} from '../src/ActionButton';
+import {AlertDialog} from '../src/AlertDialog';
+import {Content} from '../src/Content';
+import {DialogTrigger} from '../src/DialogTrigger';
+import React from 'react';
+import userEvent from '@testing-library/user-event';
+
+describe('AlertDialog', () => {
+  let user;
+  beforeAll(() => {
+    jest.useFakeTimers();
+    user = userEvent.setup({delay: null, pointerMap});
+  });
+
+  afterEach(() => {
+    jest.clearAllMocks();
+    act(() => jest.runAllTimers());
+  });
+
+  afterAll(function () {
+    jest.restoreAllMocks();
+  });
+
+  it('automatically links to the content with aria-describedby', async () => {
+    let {getByRole} = render(
+      <DialogTrigger>
+        <ActionButton>Open dialog</ActionButton>
+        <AlertDialog title="Test" primaryActionLabel="Test">
+          Test content
+        </AlertDialog>
+      </DialogTrigger>
+    );
+
+    let trigger = getByRole('button');
+    await user.click(trigger);
+    act(() => {
+      jest.runAllTimers();
+    });
+    let dialog = getByRole('alertdialog');
+    expect(dialog).toBeVisible();
+    let description = dialog.getAttribute('aria-describedby');
+    expect(description).toBeDefined();
+    let content = document.getElementById(description!);
+    expect(content).toHaveTextContent('Test content');
+  });
+
+  it('accepts custom aria-describedby', async () => {
+    let {getByRole} = render(
+      <DialogTrigger>
+        <ActionButton>Open dialog</ActionButton>
+        <AlertDialog aria-describedby="content-id" title="Test" primaryActionLabel="Test">
+          <Content>
+            <p id="content-id">Test content</p>
+            <p>Extra content</p>
+          </Content>
+        </AlertDialog>
+      </DialogTrigger>
+    );
+
+    let trigger = getByRole('button');
+    await user.click(trigger);
+    act(() => {
+      jest.runAllTimers();
+    });
+    let dialog = getByRole('alertdialog');
+    expect(dialog).toBeVisible();
+    let description = dialog.getAttribute('aria-describedby');
+    expect(description).toBeDefined();
+    let content = document.getElementById(description!);
+    expect(content).toHaveTextContent('Test content');
+  });
+});
diff --git a/packages/@react-spectrum/s2/test/StandardDialog.test.tsx b/packages/@react-spectrum/s2/test/StandardDialog.test.tsx
new file mode 100644
index 00000000000..a35318fd556
--- /dev/null
+++ b/packages/@react-spectrum/s2/test/StandardDialog.test.tsx
@@ -0,0 +1,120 @@
+/*
+ * Copyright 2025 Adobe. All rights reserved.
+ * This file is licensed to you under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License. You may obtain a copy
+ * of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under
+ * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
+ * OF ANY KIND, either express or implied. See the License for the specific language
+ * governing permissions and limitations under the License.
+ */
+
+import {act, pointerMap, render} from '@react-spectrum/test-utils-internal';
+import {ActionButton} from '../src/ActionButton';
+import {Button} from '../src/Button';
+import {ButtonGroup} from '../src/ButtonGroup';
+import {Checkbox} from '../src/Checkbox';
+import {Content, Footer, Header, Heading} from '../src/Content';
+import {Dialog} from '../src/Dialog';
+import {DialogTrigger} from '../src/DialogTrigger';
+import React from 'react';
+import userEvent from '@testing-library/user-event';
+
+describe('StandardDialog', () => {
+  let user;
+  beforeAll(() => {
+    jest.useFakeTimers();
+    user = userEvent.setup({delay: null, pointerMap});
+  });
+
+  afterEach(() => {
+    jest.clearAllMocks();
+    act(() => jest.runAllTimers());
+  });
+
+  afterAll(function () {
+    jest.restoreAllMocks();
+  });
+
+  it('does not automatically add aria-describedby', async () => {
+    let {getByRole} = render(
+      <DialogTrigger>
+        <ActionButton>Open dialog</ActionButton>
+        <Dialog>
+          {({close}) => (
+            <>
+              <Heading slot="title">Dialog title</Heading>
+              <Header>Header</Header>
+              <Content>This is the content of the dialog.</Content>
+              <Footer>
+                <Checkbox>Don't show this again</Checkbox>
+              </Footer>
+              <ButtonGroup>
+                <Button onPress={close} variant="secondary">
+                  Cancel
+                </Button>
+                <Button onPress={close} variant="accent">
+                  Save
+                </Button>
+              </ButtonGroup>
+            </>
+          )}
+        </Dialog>
+      </DialogTrigger>
+    );
+
+    let trigger = getByRole('button');
+    await user.click(trigger);
+    act(() => {
+      jest.runAllTimers();
+    });
+    let dialog = getByRole('dialog');
+    expect(dialog).toBeVisible();
+    let description = dialog.getAttribute('aria-describedby');
+    expect(description).toBeNull();
+  });
+
+  it('accepts custom aria-describedby', async () => {
+    let {getByRole} = render(
+      <DialogTrigger>
+        <ActionButton>Open dialog</ActionButton>
+        <Dialog aria-describedby="content-id">
+          {({close}) => (
+            <>
+              <Heading slot="title">Dialog title</Heading>
+              <Header>Header</Header>
+              <Content>
+                <p id="content-id">This is the content of the dialog.</p>
+                <p>Extra content</p>
+              </Content>
+              <Footer>
+                <Checkbox>Don't show this again</Checkbox>
+              </Footer>
+              <ButtonGroup>
+                <Button onPress={close} variant="secondary">
+                  Cancel
+                </Button>
+                <Button onPress={close} variant="accent">
+                  Save
+                </Button>
+              </ButtonGroup>
+            </>
+          )}
+        </Dialog>
+      </DialogTrigger>
+    );
+
+    let trigger = getByRole('button');
+    await user.click(trigger);
+    act(() => {
+      jest.runAllTimers();
+    });
+    let dialog = getByRole('dialog');
+    expect(dialog).toBeVisible();
+    let description = dialog.getAttribute('aria-describedby');
+    expect(description).toBeDefined();
+    let content = document.getElementById(description!);
+    expect(content).toHaveTextContent('This is the content of the dialog.');
+  });
+});
diff --git a/packages/dev/s2-docs/pages/s2/Dialog.mdx b/packages/dev/s2-docs/pages/s2/Dialog.mdx
index ba071d22176..94dc70e7dfb 100644
--- a/packages/dev/s2-docs/pages/s2/Dialog.mdx
+++ b/packages/dev/s2-docs/pages/s2/Dialog.mdx
@@ -29,7 +29,7 @@ function Example(props) {
       <Dialog {...props}/* PROPS */>
         {({close}) => (
           <>
-            <Image slot="hero" src={heroImage} />
+            <Image slot="hero" src={heroImage} alt="" />
             <Heading slot="title">Subscribe to our newsletter</Heading>
             <Content>
               <p>Enter your information to subscribe to our newsletter and receive updates about new features and announcements.</p>
@@ -76,7 +76,7 @@ function Example(props) {
       <Dialog {...props}/* PROPS */>
         {({close}) => (
           <>
-            <Image slot="hero" src={heroImage} />
+            <Image slot="hero" src={heroImage} alt="" />
             <Heading slot="title">Dialog Title</Heading>
             <Header>Header</Header>
             <Content>
diff --git a/packages/react-aria-components/src/Dialog.tsx b/packages/react-aria-components/src/Dialog.tsx
index 4b3009c861d..128fff599b3 100644
--- a/packages/react-aria-components/src/Dialog.tsx
+++ b/packages/react-aria-components/src/Dialog.tsx
@@ -40,6 +40,7 @@ import React, {
   useRef
 } from 'react';
 import {RootMenuTriggerStateContext} from './Menu';
+import {TextContext} from './Text';
 import {useId} from 'react-aria/useId';
 import {useMenuTriggerState} from 'react-stately/useMenuTriggerState';
 import {useOverlayTrigger} from 'react-aria/useOverlayTrigger';
@@ -120,7 +121,7 @@ export const Dialog = /*#__PURE__*/ (forwardRef as forwardRefType)(function Dial
 ) {
   let originalAriaLabelledby = props['aria-labelledby'];
   [props, ref] = useContextProps(props, ref, DialogContext);
-  let {dialogProps, titleProps} = useDialog(
+  let {dialogProps, titleProps, contentProps} = useDialog(
     {
       ...props,
       // Only pass aria-labelledby from props, not context.
@@ -172,6 +173,15 @@ export const Dialog = /*#__PURE__*/ (forwardRef as forwardRefType)(function Dial
               }
             }
           ],
+          [
+            TextContext,
+            {
+              slots: {
+                [DEFAULT_SLOT]: {},
+                description: contentProps
+              }
+            }
+          ],
           [
             ButtonContext,
             {
diff --git a/packages/react-aria-components/test/Dialog.test.js b/packages/react-aria-components/test/Dialog.test.js
index 7864e5cd002..c1d040ace74 100644
--- a/packages/react-aria-components/test/Dialog.test.js
+++ b/packages/react-aria-components/test/Dialog.test.js
@@ -23,6 +23,7 @@ import {OverlayArrow} from '../src/OverlayArrow';
 import {Popover} from '../src/Popover';
 import React, {useRef} from 'react';
 import * as stories from '../stories/Modal.stories';
+import {Text} from '../src/Text';
 import {TextField} from '../src/TextField';
 import {UNSAFE_PortalProvider} from 'react-aria/PortalProvider';
 import {User} from '@react-aria/test-utils';
@@ -59,6 +60,7 @@ describe('Dialog', () => {
             {({close}) => (
               <>
                 <Heading slot="title">Alert</Heading>
+                <Text slot="description">This is the alert message.</Text>
                 <Button onPress={close}>Close</Button>
               </>
             )}
@@ -75,7 +77,6 @@ describe('Dialog', () => {
     let heading = getByRole('heading');
     expect(dialog).toHaveAttribute('aria-labelledby', heading.id);
     expect(dialog).toHaveAttribute('data-test', 'dialog');
-
     expect(dialog.closest('.react-aria-Modal')).toHaveAttribute('data-test', 'modal');
     expect(dialog.closest('.react-aria-ModalOverlay')).toBeInTheDocument();
 
@@ -85,6 +86,36 @@ describe('Dialog', () => {
     expect(dialog).not.toBeInTheDocument();
   });
 
+  it('should set aria-describedby when Text slot="description" is used in alertdialog', async () => {
+    let {getByRole} = render(
+      <DialogTrigger>
+        <Button>Open</Button>
+        <Modal>
+          <Dialog role="alertdialog">
+            {({close}) => (
+              <>
+                <Heading slot="title">Alert Title</Heading>
+                <Text slot="description">This is the alert message.</Text>
+                <Button onPress={close}>OK</Button>
+              </>
+            )}
+          </Dialog>
+        </Modal>
+      </DialogTrigger>
+    );
+
+    let button = getByRole('button');
+    let dialogTester = testUtilUser.createTester('Dialog', {root: button, overlayType: 'modal'});
+    await dialogTester.open();
+    let dialog = dialogTester.dialog;
+    expect(dialog).toHaveAttribute('role', 'alertdialog');
+    expect(dialog).toHaveAttribute('aria-describedby');
+    let descId = dialog.getAttribute('aria-describedby');
+    let descEl = document.getElementById(descId);
+    expect(descEl).not.toBeNull();
+    expect(descEl.textContent).toBe('This is the alert message.');
+  });
+
   it('works with modal and custom underlay', async () => {
     let {getByRole} = render(
       <DialogTrigger>
@@ -95,6 +126,7 @@ describe('Dialog', () => {
               {({close}) => (
                 <>
                   <Heading slot="title">Alert</Heading>
+                  <Text slot="description">This is the alert message.</Text>
                   <Button onPress={close}>Close</Button>
                 </>
               )}
@@ -130,6 +162,7 @@ describe('Dialog', () => {
             {({close}) => (
               <>
                 <Heading slot="title">Alert</Heading>
+                <Text slot="description">This is the alert message.</Text>
                 <Button onPress={close}>Close</Button>
               </>
             )}
@@ -325,6 +358,7 @@ describe('Dialog', () => {
               {({close}) => (
                 <>
                   <Heading slot="title">Alert</Heading>
+                  <Text slot="description">This is the alert message.</Text>
                   <Button onPress={close}>Close</Button>
                 </>
               )}
@@ -367,6 +401,7 @@ describe('Dialog', () => {
               {({close}) => (
                 <>
                   <Heading slot="title">Alert</Heading>
+                  <Text slot="description">This is the alert message.</Text>
                   <Button onPress={close}>Close</Button>
                 </>
               )}
diff --git a/packages/react-aria-components/test/RadioGroup.test.js b/packages/react-aria-components/test/RadioGroup.test.js
index ca27333d12d..0a68d7253d8 100644
--- a/packages/react-aria-components/test/RadioGroup.test.js
+++ b/packages/react-aria-components/test/RadioGroup.test.js
@@ -524,6 +524,7 @@ describe.each(['RadioGroup', 'RadioField'])('%s', comp => {
                     buttonClassName: ({isFocusVisible}) => (isFocusVisible ? 'focus' : '')
                   }}
                 />
+                <Text slot="description">Alert description</Text>
                 <Button onPress={close}>Close</Button>
               </>
             )}
diff --git a/packages/react-aria/src/dialog/useDialog.ts b/packages/react-aria/src/dialog/useDialog.ts
index 4e3a237ddee..40babfd555d 100644
--- a/packages/react-aria/src/dialog/useDialog.ts
+++ b/packages/react-aria/src/dialog/useDialog.ts
@@ -38,6 +38,9 @@ export interface DialogAria {
 
   /** Props for the dialog title element. */
   titleProps: DOMAttributes;
+
+  /** Props for the dialog content/description element. Used for aria-describedby on alertdialogs. */
+  contentProps: DOMAttributes;
 }
 
 /**
@@ -52,6 +55,9 @@ export function useDialog(
   let titleId: string | undefined = useSlotId();
   titleId = props['aria-label'] ? undefined : titleId;
 
+  let contentId: string | undefined = useSlotId();
+  contentId = role === 'alertdialog' && !props['aria-describedby'] ? contentId : undefined;
+
   let isRefocusing = useRef(false);
 
   // Focus the dialog itself on mount, unless a child element is already focused.
@@ -104,6 +110,19 @@ export function useDialog(
     }
   });
 
+  let ariaDescribedby = props['aria-describedby'] ?? contentId;
+  let hasAriaDescribedbyWarn = useRef(false);
+  useEffect(() => {
+    if (!ariaDescribedby && props['role'] === 'alertdialog') {
+      if (process.env.NODE_ENV !== 'production' && !hasAriaDescribedbyWarn.current) {
+        console.warn(
+          'If a Dialog does not contain a <Text slot="description">, it must have an aria-describedby for accessibility'
+        );
+        hasAriaDescribedbyWarn.current = true;
+      }
+    }
+  });
+
   // We do not use aria-modal due to a Safari bug which forces the first focusable element to be focused
   // on mount when inside an iframe, no matter which element we programmatically focus.
   // See https://bugs.webkit.org/show_bug.cgi?id=211934.
@@ -114,7 +133,8 @@ export function useDialog(
       ...filterDOMProps(props, {labelable: true}),
       role,
       tabIndex: -1,
-      'aria-labelledby': props['aria-labelledby'] || titleId,
+      'aria-labelledby': props['aria-labelledby'] ?? titleId,
+      'aria-describedby': ariaDescribedby,
       // Prevent blur events from reaching useOverlay, which may cause
       // popovers to close. Since focus is contained within the dialog,
       // we don't want this to occur due to the above useEffect.
@@ -126,6 +146,9 @@ export function useDialog(
     },
     titleProps: {
       id: titleId
+    },
+    contentProps: {
+      id: contentId
     }
   };
 }
diff --git a/packages/react-aria/test/dialog/useDialog.test.js b/packages/react-aria/test/dialog/useDialog.test.js
index 13f469e5771..83c0b09c91a 100644
--- a/packages/react-aria/test/dialog/useDialog.test.js
+++ b/packages/react-aria/test/dialog/useDialog.test.js
@@ -33,7 +33,9 @@ describe('useDialog', function () {
   });
 
   it('should accept role="alertdialog"', function () {
-    let res = render(<Example role="alertdialog" aria-label="Test dialog" />);
+    let res = render(
+      <Example role="alertdialog" aria-label="Test dialog" aria-describedby="content-id" />
+    );
     let el = res.getByTestId('test');
     expect(el).toHaveAttribute('role', 'alertdialog');
   });
@@ -55,6 +57,61 @@ describe('useDialog', function () {
     expect(document.activeElement).toBe(input);
   });
 
+  describe('aria-describedby for alertdialog', function () {
+    function AlertDialogExample(props) {
+      let ref = useRef();
+      let {dialogProps, titleProps, contentProps} = useDialog({role: 'alertdialog', ...props}, ref);
+      return (
+        <div ref={ref} {...dialogProps} data-testid="test">
+          <h2 {...titleProps}>Alert Title</h2>
+          {props.showContent && <p {...contentProps}>Alert message content</p>}
+          {props.children}
+        </div>
+      );
+    }
+
+    it('should set aria-describedby on alertdialog when content is rendered', function () {
+      let res = render(<AlertDialogExample aria-label="Test" showContent />);
+      let el = res.getByTestId('test');
+      let contentEl = el.querySelector('p');
+      expect(el).toHaveAttribute('aria-describedby', contentEl.id);
+    });
+
+    it('should not auto-wire aria-describedby on regular dialog, but contentProps.id is still provided', function () {
+      function RegularDialogExample(props) {
+        let ref = useRef();
+        let {dialogProps, titleProps, contentProps} = useDialog(props, ref);
+        return (
+          <div ref={ref} {...dialogProps} data-testid="test">
+            <h2 {...titleProps}>Title</h2>
+            <p {...contentProps}>Content</p>
+          </div>
+        );
+      }
+
+      let res = render(<RegularDialogExample aria-label="Test" />);
+      let el = res.getByTestId('test');
+      expect(el).not.toHaveAttribute('aria-describedby');
+    });
+
+    it('should allow aria-describedby override on alertdialog', function () {
+      let res = render(
+        <AlertDialogExample aria-label="Test" aria-describedby="custom-id" showContent />
+      );
+      let el = res.getByTestId('test');
+      expect(el).toHaveAttribute('aria-describedby', 'custom-id');
+    });
+
+    it('should not generate contentProps.id when aria-describedby is provided', function () {
+      let res = render(
+        <AlertDialogExample aria-label="Test" aria-describedby="custom-id" showContent />
+      );
+      let el = res.getByTestId('test');
+      let contentEl = el.querySelector('p');
+      expect(contentEl).not.toHaveAttribute('id');
+    });
+  });
+
   describe('dev warnings', function () {
     let originalWarn;