diff --git a/.changeset/giant-loops-send.md b/.changeset/giant-loops-send.md
new file mode 100644
index 00000000000..9b0a22a6979
--- /dev/null
+++ b/.changeset/giant-loops-send.md
@@ -0,0 +1,5 @@
+---
+'@primer/react': minor
+---
+
+Add leadingVisual to InlineMessage component.
diff --git a/packages/react/src/InlineMessage/InlineMessage.docs.json b/packages/react/src/InlineMessage/InlineMessage.docs.json
index eaa28ca23dd..27ec3bd3f8e 100644
--- a/packages/react/src/InlineMessage/InlineMessage.docs.json
+++ b/packages/react/src/InlineMessage/InlineMessage.docs.json
@@ -37,6 +37,12 @@
       "description": "Specify the type of the inline message",
       "type": "'critical' | 'success' | 'unvailable' | 'warning'",
       "required": true
+    },
+    {
+      "name": "leadingVisual",
+      "description": "A custom leading visual to display instead of the default variant icon.",
+      "type": "React.ElementType | React.ReactNode",
+      "required": false
     }
   ]
-}
+}
\ No newline at end of file
diff --git a/packages/react/src/InlineMessage/InlineMessage.stories.tsx b/packages/react/src/InlineMessage/InlineMessage.stories.tsx
index 23d190488c1..6dabc253fa6 100644
--- a/packages/react/src/InlineMessage/InlineMessage.stories.tsx
+++ b/packages/react/src/InlineMessage/InlineMessage.stories.tsx
@@ -1,4 +1,14 @@
 import type {Meta, StoryObj} from '@storybook/react-vite'
+import {
+  AlertIcon,
+  CheckCircleIcon,
+  InfoIcon,
+  LockIcon,
+  RocketIcon,
+  XCircleIcon,
+  HeartIcon,
+  StarIcon,
+} from '@primer/octicons-react'
 import {InlineMessage} from '../InlineMessage'
 
 const meta = {
@@ -12,9 +22,27 @@ export const Default = () => {
   return <InlineMessage variant="unavailable">An example inline message</InlineMessage>
 }
 
+const iconMap = {
+  default: undefined,
+  InfoIcon,
+  LockIcon,
+  RocketIcon,
+  AlertIcon,
+  CheckCircleIcon,
+  XCircleIcon,
+  HeartIcon,
+  StarIcon,
+} as const
+
 export const Playground: StoryObj<typeof InlineMessage> = {
   render(args) {
-    return <InlineMessage {...args}>An example inline message</InlineMessage>
+    const {leadingVisual: leadingVisualOption, ...rest} = args
+    const leadingVisual = leadingVisualOption ? iconMap[leadingVisualOption as keyof typeof iconMap] : undefined
+    return (
+      <InlineMessage {...rest} leadingVisual={leadingVisual}>
+        An example inline message
+      </InlineMessage>
+    )
   },
   argTypes: {
     size: {
@@ -29,9 +57,18 @@ export const Playground: StoryObj<typeof InlineMessage> = {
       },
       options: ['critical', 'success', 'unavailable', 'warning'],
     },
+    leadingVisual: {
+      name: 'leadingVisual',
+      control: {
+        type: 'select',
+      },
+      options: Object.keys(iconMap),
+      description: 'Select a custom icon to override the default variant icon',
+    },
   },
   args: {
     size: 'medium',
     variant: 'success',
+    leadingVisual: 'default',
   },
 }
diff --git a/packages/react/src/InlineMessage/InlineMessage.test.tsx b/packages/react/src/InlineMessage/InlineMessage.test.tsx
index b7448da6b10..4678a2e5ded 100644
--- a/packages/react/src/InlineMessage/InlineMessage.test.tsx
+++ b/packages/react/src/InlineMessage/InlineMessage.test.tsx
@@ -1,6 +1,8 @@
 import {render, screen} from '@testing-library/react'
 import {describe, expect, it, test} from 'vitest'
+import {InfoIcon} from '@primer/octicons-react'
 import {InlineMessage} from '../InlineMessage'
+import React from 'react'
 
 describe('InlineMessage', () => {
   it('should render content passed as `children`', () => {
@@ -79,4 +81,41 @@ describe('InlineMessage', () => {
     )
     expect(screen.getByTestId('container')).toHaveAttribute('data-variant', 'warning')
   })
+
+  it('should render leading visual', () => {
+    render(
+      <>
+        <InlineMessage variant="critical" leadingVisual={<InfoIcon data-testid="info-icon" />}>
+          test with custom icon
+        </InlineMessage>
+        <InlineMessage
+          variant="critical"
+          leadingVisual={React.memo(() => (
+            <div data-testid="memo">leadingVisual</div>
+          ))}
+        >
+          test with memo icon
+        </InlineMessage>
+        <InlineMessage
+          variant="critical"
+          leadingVisual={React.forwardRef(() => (
+            <div data-testid="forward-ref">leadingVisual</div>
+          ))}
+        >
+          test with forward ref icon
+        </InlineMessage>
+      </>,
+    )
+    expect(screen.getByTestId('info-icon')).toBeInTheDocument()
+    expect(screen.getByTestId('memo')).toBeInTheDocument()
+    expect(screen.getByTestId('forward-ref')).toBeInTheDocument()
+  })
+
+  it('should use default icon when `leadingVisual` is not provided', () => {
+    const {container} = render(<InlineMessage variant="success">test with default icon</InlineMessage>)
+    expect(screen.getByText('test with default icon')).toBeInTheDocument()
+    // Default icon should be rendered
+    const svg = container.querySelector('svg')
+    expect(svg).toBeInTheDocument()
+  })
 })
diff --git a/packages/react/src/InlineMessage/InlineMessage.tsx b/packages/react/src/InlineMessage/InlineMessage.tsx
index 002f0577533..307f17e82d7 100644
--- a/packages/react/src/InlineMessage/InlineMessage.tsx
+++ b/packages/react/src/InlineMessage/InlineMessage.tsx
@@ -1,6 +1,7 @@
 import {AlertFillIcon, AlertIcon, CheckCircleFillIcon, CheckCircleIcon} from '@primer/octicons-react'
 import {clsx} from 'clsx'
 import type React from 'react'
+import {isValidElementType} from 'react-is'
 import classes from './InlineMessage.module.css'
 type MessageVariant = 'critical' | 'success' | 'unavailable' | 'warning'
 
@@ -14,6 +15,11 @@ export type InlineMessageProps = React.ComponentPropsWithoutRef<'div'> & {
    * Specify the type of the InlineMessage
    */
   variant: MessageVariant
+
+  /**
+   * A custom leading visual (icon or other element) to display instead of the default variant icon.
+   */
+  leadingVisual?: React.ElementType | React.ReactNode
 }
 
 const icons: Record<MessageVariant, React.ReactNode> = {
@@ -30,8 +36,26 @@ const smallIcons: Record<MessageVariant, React.ReactNode> = {
   unavailable: <AlertFillIcon className={classes.InlineMessageIcon} size={12} />,
 }
 
-export function InlineMessage({children, className, size = 'medium', variant, ...rest}: InlineMessageProps) {
-  const icon = size === 'small' ? smallIcons[variant] : icons[variant]
+export function InlineMessage({
+  children,
+  className,
+  size = 'medium',
+  variant,
+  leadingVisual: LeadingVisual,
+  ...rest
+}: InlineMessageProps) {
+  let icon: React.ReactNode
+
+  if (LeadingVisual !== undefined) {
+    if (typeof LeadingVisual !== 'string' && isValidElementType(LeadingVisual)) {
+      icon = <LeadingVisual className={classes.InlineMessageIcon} />
+    } else {
+      icon = LeadingVisual
+    }
+  } else {
+    // Use default icon based on variant and size
+    icon = size === 'small' ? smallIcons[variant] : icons[variant]
+  }
 
   return (
     <div {...rest} className={clsx(className, classes.InlineMessage)} data-size={size} data-variant={variant}>