diff --git a/.changeset/rotten-mugs-tan.md b/.changeset/rotten-mugs-tan.md
new file mode 100644
index 00000000000..4d252daf038
--- /dev/null
+++ b/.changeset/rotten-mugs-tan.md
@@ -0,0 +1,5 @@
+---
+'@primer/react': minor
+---
+
+feat: make Spinner's delay customizable
diff --git a/package-lock.json b/package-lock.json
index 932603416c8..083c22b70b4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -81,7 +81,7 @@
         "react-dom": "^18.3.1"
       },
       "devDependencies": {
-        "@primer/react": "38.7.0",
+        "@primer/react": "38.7.1",
         "@primer/styled-react": "1.0.2",
         "@types/react": "^18.3.11",
         "@types/react-dom": "^18.3.0",
@@ -95,7 +95,7 @@
       "name": "example-nextjs",
       "version": "0.0.0",
       "dependencies": {
-        "@primer/react": "38.7.0",
+        "@primer/react": "38.7.1",
         "@primer/styled-react": "1.0.2",
         "next": "^16.0.10",
         "react": "^19.2.0",
@@ -138,7 +138,7 @@
       "version": "0.0.0",
       "dependencies": {
         "@primer/octicons-react": "^19.21.0",
-        "@primer/react": "38.7.0",
+        "@primer/react": "38.7.1",
         "@primer/styled-react": "1.0.2",
         "clsx": "^2.1.1",
         "next": "^16.0.10",
@@ -26428,7 +26428,7 @@
     },
     "packages/react": {
       "name": "@primer/react",
-      "version": "38.7.0",
+      "version": "38.7.1",
       "license": "MIT",
       "dependencies": {
         "@github/mini-throttle": "^2.1.1",
diff --git a/packages/react/src/Spinner/Spinner.docs.json b/packages/react/src/Spinner/Spinner.docs.json
index 4c71b59f068..a98a2e49c0d 100644
--- a/packages/react/src/Spinner/Spinner.docs.json
+++ b/packages/react/src/Spinner/Spinner.docs.json
@@ -33,9 +33,9 @@
     },
     {
       "defaultValue": "false",
-      "description": "Whether to delay the spinner before rendering by the defined 1000ms.",
+      "description": "Controls whether and how long to delay rendering the spinner. Set to `true` to delay by 1000ms, `'short'` to delay by 300ms, `'long'` to delay by 1000ms, or provide a custom number of milliseconds.",
       "name": "delay",
-      "type": "boolean"
+      "type": "boolean | 'short' | 'long' | number"
     }
   ],
   "status": "alpha",
diff --git a/packages/react/src/Spinner/Spinner.features.stories.tsx b/packages/react/src/Spinner/Spinner.features.stories.tsx
index 3d884d3193f..e27144c084b 100644
--- a/packages/react/src/Spinner/Spinner.features.stories.tsx
+++ b/packages/react/src/Spinner/Spinner.features.stories.tsx
@@ -20,4 +20,4 @@ export const SuppressScreenReaderText = () => (
   </Stack>
 )
 
-export const WithDelay = () => <Spinner delay />
+export const WithDelay = () => <Spinner delay="long" />
diff --git a/packages/react/src/Spinner/Spinner.test.tsx b/packages/react/src/Spinner/Spinner.test.tsx
index 735d7d61a81..caf2eefd776 100644
--- a/packages/react/src/Spinner/Spinner.test.tsx
+++ b/packages/react/src/Spinner/Spinner.test.tsx
@@ -62,6 +62,11 @@ describe('Spinner', () => {
       expect(container.querySelector('svg')).toBeInTheDocument()
     })
 
+    it('should render immediately when no delay is provided', () => {
+      const {container} = render(<Spinner />)
+      expect(container.querySelector('svg')).toBeInTheDocument()
+    })
+
     it('should not render immediately when delay is true', () => {
       const {container} = render(<Spinner delay={true} />)
       expect(container.querySelector('svg')).not.toBeInTheDocument()
@@ -73,9 +78,96 @@ describe('Spinner', () => {
       // Not visible initially
       expect(container.querySelector('svg')).not.toBeInTheDocument()
 
-      // Advance timers by 1000ms
+      // Advance timers by less than 1000ms
+      act(() => {
+        vi.advanceTimersByTime(800)
+      })
+
+      // Still not visible
+      expect(container.querySelector('svg')).not.toBeInTheDocument()
+
+      // Advance timers to complete the delay (1000ms)
       act(() => {
-        vi.advanceTimersByTime(1000)
+        vi.advanceTimersByTime(200)
+      })
+
+      // Now it should be visible
+      expect(container.querySelector('svg')).toBeInTheDocument()
+    })
+
+    it('should not render immediately when delay is "short"', () => {
+      const {container} = render(<Spinner delay="short" />)
+      expect(container.querySelector('svg')).not.toBeInTheDocument()
+    })
+
+    it('should render after 300ms when delay is "short"', () => {
+      const {container} = render(<Spinner delay="short" />)
+
+      // Not visible initially
+      expect(container.querySelector('svg')).not.toBeInTheDocument()
+
+      // Advance timers by less than 300ms
+      act(() => {
+        vi.advanceTimersByTime(250)
+      })
+
+      // Still not visible
+      expect(container.querySelector('svg')).not.toBeInTheDocument()
+
+      // Advance timers to complete the short delay (300ms)
+      act(() => {
+        vi.advanceTimersByTime(50)
+      })
+
+      // Now it should be visible
+      expect(container.querySelector('svg')).toBeInTheDocument()
+    })
+
+    it('should not render immediately when delay is "long"', () => {
+      const {container} = render(<Spinner delay="long" />)
+      expect(container.querySelector('svg')).not.toBeInTheDocument()
+    })
+
+    it('should render after 1000ms when delay is "long"', () => {
+      const {container} = render(<Spinner delay="long" />)
+
+      // Not visible initially
+      expect(container.querySelector('svg')).not.toBeInTheDocument()
+
+      // Advance timers by less than 1000ms
+      act(() => {
+        vi.advanceTimersByTime(800)
+      })
+
+      // Still not visible
+      expect(container.querySelector('svg')).not.toBeInTheDocument()
+
+      // Advance timers to complete the long delay (1000ms)
+      act(() => {
+        vi.advanceTimersByTime(200)
+      })
+
+      // Now it should be visible
+      expect(container.querySelector('svg')).toBeInTheDocument()
+    })
+
+    it('should render after custom ms when delay is a number', () => {
+      const {container} = render(<Spinner delay={500} />)
+
+      // Not visible initially
+      expect(container.querySelector('svg')).not.toBeInTheDocument()
+
+      // Advance timers by less than the custom delay (500ms)
+      act(() => {
+        vi.advanceTimersByTime(400)
+      })
+
+      // Still not visible
+      expect(container.querySelector('svg')).not.toBeInTheDocument()
+
+      // Advance timers to complete the custom delay
+      act(() => {
+        vi.advanceTimersByTime(100)
       })
 
       // Now it should be visible
@@ -94,5 +186,44 @@ describe('Spinner', () => {
       // No errors should occur
       expect(true).toBe(true)
     })
+
+    it('should cleanup timeout on unmount when delay is "short"', () => {
+      const {unmount} = render(<Spinner delay="short" />)
+
+      // Unmount before the delay completes
+      unmount()
+
+      // Advance timers to see if there are any side effects
+      vi.advanceTimersByTime(300)
+
+      // No errors should occur
+      expect(true).toBe(true)
+    })
+
+    it('should cleanup timeout on unmount when delay is "long"', () => {
+      const {unmount} = render(<Spinner delay="long" />)
+
+      // Unmount before the delay completes
+      unmount()
+
+      // Advance timers to see if there are any side effects
+      vi.advanceTimersByTime(1000)
+
+      // No errors should occur
+      expect(true).toBe(true)
+    })
+
+    it('should cleanup timeout on unmount when delay is a number', () => {
+      const {unmount} = render(<Spinner delay={500} />)
+
+      // Unmount before the delay completes
+      unmount()
+
+      // Advance timers to see if there are any side effects
+      vi.advanceTimersByTime(500)
+
+      // No errors should occur
+      expect(true).toBe(true)
+    })
   })
 })
diff --git a/packages/react/src/Spinner/Spinner.tsx b/packages/react/src/Spinner/Spinner.tsx
index 73945964036..a212b580aa1 100644
--- a/packages/react/src/Spinner/Spinner.tsx
+++ b/packages/react/src/Spinner/Spinner.tsx
@@ -23,8 +23,8 @@ export type SpinnerProps = {
   'aria-label'?: string
   className?: string
   style?: React.CSSProperties
-  /** Whether to delay the spinner before rendering by the defined 1000ms. */
-  delay?: boolean
+  /** Controls whether and how long to delay rendering the spinner. Set to `true` to delay by 1000ms, `'short'` to delay by 300ms, `'long'` to delay by 1000ms, or provide a custom number of milliseconds. */
+  delay?: boolean | 'short' | 'long' | number
 } & HTMLDataAttributes
 
 function Spinner({
@@ -46,9 +46,10 @@ function Spinner({
 
   useEffect(() => {
     if (delay) {
+      const delayDuration = typeof delay === 'number' ? delay : delay === 'short' ? 300 : 1000
       const timeoutId = setTimeout(() => {
         setIsVisible(true)
-      }, 1000)
+      }, delayDuration)
 
       return () => clearTimeout(timeoutId)
     }