diff --git a/.changeset/mighty-buckets-push.md b/.changeset/mighty-buckets-push.md
new file mode 100644
index 00000000000..4d4b0f6eea5
--- /dev/null
+++ b/.changeset/mighty-buckets-push.md
@@ -0,0 +1,5 @@
+---
+"@primer/react": minor
+---
+
+Convert `Breadcrumbs` and `Breadcrumbs.Item` to CSS modules behind the primer_react_css_modules_team feature flag
diff --git a/e2e/components/Breadcrumbs.test.ts b/e2e/components/Breadcrumbs.test.ts
index 5b4a763084e..badd8ea4c0f 100644
--- a/e2e/components/Breadcrumbs.test.ts
+++ b/e2e/components/Breadcrumbs.test.ts
@@ -11,6 +11,32 @@ test.describe('Breadcrumbs', () => {
             id: 'components-breadcrumbs--default',
             globals: {
               colorScheme: theme,
+              featureFlags: {
+                primer_react_css_modules_team: true,
+              },
+            },
+          })
+
+          // Default state
+          expect(await page.screenshot()).toMatchSnapshot(`Breadcrumbs.Default.${theme}.png`)
+
+          // Hover state
+          await page.getByRole('link', {name: 'Home'}).hover()
+          expect(await page.screenshot()).toMatchSnapshot(`Breadcrumbs.Default.${theme}.hover.png`)
+
+          // Focus state
+          await page.keyboard.press('Tab')
+          expect(await page.screenshot()).toMatchSnapshot(`Breadcrumbs.Default.${theme}.focus.png`)
+        })
+
+        test('default @vrt (styled components)', async ({page}) => {
+          await visit(page, {
+            id: 'components-breadcrumbs--default',
+            globals: {
+              colorScheme: theme,
+              featureFlags: {
+                primer_react_css_modules_team: false,
+              },
             },
           })
 
@@ -31,6 +57,28 @@ test.describe('Breadcrumbs', () => {
             id: 'components-breadcrumbs--default',
             globals: {
               colorScheme: theme,
+              featureFlags: {
+                primer_react_css_modules_team: true,
+              },
+            },
+          })
+          await expect(page).toHaveNoViolations({
+            rules: {
+              'color-contrast': {
+                enabled: theme !== 'dark_dimmed',
+              },
+            },
+          })
+        })
+
+        test('axe @aat (styled components)', async ({page}) => {
+          await visit(page, {
+            id: 'components-breadcrumbs--default',
+            globals: {
+              colorScheme: theme,
+              featureFlags: {
+                primer_react_css_modules_team: false,
+              },
             },
           })
           await expect(page).toHaveNoViolations({
diff --git a/packages/react/src/Banner/Banner.tsx b/packages/react/src/Banner/Banner.tsx
index 6b85cf67c5e..f33021d67d7 100644
--- a/packages/react/src/Banner/Banner.tsx
+++ b/packages/react/src/Banner/Banner.tsx
@@ -209,6 +209,7 @@ const StyledBanner = toggleStyledComponent(
    * line-height of `20px` so that means that the height of icons should match
    * that value.
    */
+  'div',
   styled.div`
     display: grid;
     grid-template-columns: auto minmax(0, 1fr) auto;
diff --git a/packages/react/src/Breadcrumbs/Breadcrumbs.module.css b/packages/react/src/Breadcrumbs/Breadcrumbs.module.css
new file mode 100644
index 00000000000..9a1d621fa39
--- /dev/null
+++ b/packages/react/src/Breadcrumbs/Breadcrumbs.module.css
@@ -0,0 +1,57 @@
+.BreadcrumbsBase {
+  display: flex;
+  justify-content: space-between;
+}
+
+.BreadcrumbsList {
+  padding-left: 0;
+  margin-top: 0;
+  margin-bottom: 0;
+}
+
+.ItemWrapper {
+  display: inline-block;
+  font-size: var(--text-body-size-medium);
+  white-space: nowrap;
+  list-style: none;
+
+  &::after {
+    display: inline-block;
+    height: 0.8em;
+    /* stylelint-disable-next-line primer/spacing */
+    margin: 0 0.5em;
+    font-size: var(--text-body-size-medium);
+    content: '';
+    /* stylelint-disable-next-line primer/borders */
+    border-right: 0.1em solid var(--fgColor-muted);
+    transform: rotate(15deg) translateY(0.0625em);
+  }
+
+  &:first-child {
+    margin-left: 0;
+  }
+
+  &:last-child {
+    &::after {
+      content: none;
+    }
+  }
+}
+
+.Item {
+  display: inline-block;
+
+  &:hover,
+  &:focus {
+    text-decoration: underline;
+  }
+}
+
+.ItemSelected {
+  color: var(--fgColor-default);
+  pointer-events: none;
+
+  &:focus {
+    text-decoration: none;
+  }
+}
diff --git a/packages/react/src/Breadcrumbs/Breadcrumbs.tsx b/packages/react/src/Breadcrumbs/Breadcrumbs.tsx
index 7b1753aa853..909df8ae58d 100644
--- a/packages/react/src/Breadcrumbs/Breadcrumbs.tsx
+++ b/packages/react/src/Breadcrumbs/Breadcrumbs.tsx
@@ -7,38 +7,50 @@ import {get} from '../constants'
 import type {SxProp} from '../sx'
 import sx from '../sx'
 import type {ComponentProps} from '../utils/types'
+import classes from './Breadcrumbs.module.css'
+import {toggleStyledComponent} from '../internal/utils/toggleStyledComponent'
+import {FeatureFlags, useFeatureFlag} from '../FeatureFlags'
+import Link from '../Link'
 
 const SELECTED_CLASS = 'selected'
 
-const Wrapper = styled.li`
-  display: inline-block;
-  white-space: nowrap;
-  list-style: none;
-  &::after {
-    font-size: ${get('fontSizes.1')};
-    content: '';
+const Wrapper = toggleStyledComponent(
+  'primer_react_css_modules_team',
+  'li',
+  styled.li`
     display: inline-block;
-    height: 0.8em;
-    margin: 0 0.5em;
-    border-right: 0.1em solid;
-    border-color: ${get('colors.fg.muted')};
-    transform: rotate(15deg) translateY(0.0625em);
-  }
-  &:first-child {
-    margin-left: 0;
-  }
-  &:last-child {
+    white-space: nowrap;
+    list-style: none;
     &::after {
-      content: none;
+      font-size: ${get('fontSizes.1')};
+      content: '';
+      display: inline-block;
+      height: 0.8em;
+      margin: 0 0.5em;
+      border-right: 0.1em solid;
+      border-color: ${get('colors.fg.muted')};
+      transform: rotate(15deg) translateY(0.0625em);
     }
-  }
-`
+    &:first-child {
+      margin-left: 0;
+    }
+    &:last-child {
+      &::after {
+        content: none;
+      }
+    }
+  `,
+)
 
-const BreadcrumbsBase = styled.nav<SxProp>`
-  display: flex;
-  justify-content: space-between;
-  ${sx};
-`
+const BreadcrumbsBase = toggleStyledComponent(
+  'primer_react_css_modules_team',
+  'nav',
+  styled.nav<SxProp>`
+    display: flex;
+    justify-content: space-between;
+    ${sx};
+  `,
+)
 
 export type BreadcrumbsProps = React.PropsWithChildren<
   {
@@ -46,13 +58,31 @@ export type BreadcrumbsProps = React.PropsWithChildren<
   } & SxProp
 >
 
+const BreadcrumbsList = ({children}: React.PropsWithChildren) => {
+  const enabled = useFeatureFlag('primer_react_css_modules_team')
+  if (enabled) {
+    return <ol className={classes.BreadcrumbsList}>{children}</ol>
+  }
+
+  return (
+    <Box as="ol" my={0} pl={0}>
+      {children}
+    </Box>
+  )
+}
+
 function Breadcrumbs({className, children, sx: sxProp}: React.PropsWithChildren<BreadcrumbsProps>) {
-  const wrappedChildren = React.Children.map(children, child => <Wrapper>{child}</Wrapper>)
+  const enabled = useFeatureFlag('primer_react_css_modules_team')
+  const wrappedChildren = React.Children.map(children, child => (
+    <Wrapper className={clsx({[classes.ItemWrapper]: enabled})}>{child}</Wrapper>
+  ))
   return (
-    <BreadcrumbsBase className={className} aria-label="Breadcrumbs" sx={sxProp}>
-      <Box as="ol" my={0} pl={0}>
-        {wrappedChildren}
-      </Box>
+    <BreadcrumbsBase
+      className={clsx(className, {[classes.BreadcrumbsBase]: enabled})}
+      aria-label="Breadcrumbs"
+      sx={sxProp}
+    >
+      <BreadcrumbsList>{wrappedChildren}</BreadcrumbsList>
     </BreadcrumbsBase>
   )
 }
@@ -62,27 +92,46 @@ type StyledBreadcrumbsItemProps = {
   selected?: boolean
 } & SxProp
 
-const BreadcrumbsItem = styled.a.attrs<StyledBreadcrumbsItemProps>(props => ({
-  className: clsx(props.selected && SELECTED_CLASS, props.className),
-  'aria-current': props.selected ? 'page' : null,
-}))<StyledBreadcrumbsItemProps>`
-  color: ${get('colors.accent.fg')};
-  display: inline-block;
-  font-size: ${get('fontSizes.1')};
-  text-decoration: none;
-  &:hover,
-  &:focus {
-    text-decoration: underline;
-  }
-  &.selected {
-    color: ${get('colors.fg.default')};
-    pointer-events: none;
-  }
-  &.selected:focus {
+const StyledBreadcrumbsItem = toggleStyledComponent(
+  'primer_react_css_modules_team',
+  'a',
+  styled.a.attrs<StyledBreadcrumbsItemProps>(props => ({
+    className: clsx(props.selected && SELECTED_CLASS, props.className),
+    'aria-current': props.selected ? 'page' : null,
+  }))<StyledBreadcrumbsItemProps>`
+    color: ${get('colors.accent.fg')};
+    display: inline-block;
+    font-size: ${get('fontSizes.1')};
     text-decoration: none;
+    &:hover,
+    &:focus {
+      text-decoration: underline;
+    }
+    &.selected {
+      color: ${get('colors.fg.default')};
+      pointer-events: none;
+    }
+    &.selected:focus {
+      text-decoration: none;
+    }
+    ${sx};
+  `,
+)
+const BreadcrumbsItem = ({
+  selected,
+  ...props
+}: StyledBreadcrumbsItemProps & React.ComponentPropsWithoutRef<typeof Link>) => {
+  const enabled = useFeatureFlag('primer_react_css_modules_team')
+  if (enabled) {
+    return (
+      // Remove this when the feature flag is removed from Link
+      <FeatureFlags flags={{primer_react_css_modules_ga: true}}>
+        <Link className={clsx(classes.Item, {[classes.ItemSelected]: selected})} {...props} />
+      </FeatureFlags>
+    )
   }
-  ${sx};
-`
+  return <StyledBreadcrumbsItem selected={selected} {...props} />
+}
 
 Breadcrumbs.displayName = 'Breadcrumbs'
 
diff --git a/packages/react/src/ButtonGroup/ButtonGroup.tsx b/packages/react/src/ButtonGroup/ButtonGroup.tsx
index b700f4fcd43..74f9ff32e15 100644
--- a/packages/react/src/ButtonGroup/ButtonGroup.tsx
+++ b/packages/react/src/ButtonGroup/ButtonGroup.tsx
@@ -10,6 +10,7 @@ import {useFeatureFlag} from '../FeatureFlags'
 
 const StyledButtonGroup = toggleStyledComponent(
   'primer_react_css_modules_staff',
+  'div',
   styled.div`
     display: inline-flex;
     vertical-align: middle;
diff --git a/packages/react/src/internal/utils/__tests__/toggleStyledComponent.test.tsx b/packages/react/src/internal/utils/__tests__/toggleStyledComponent.test.tsx
index 6a4206003d0..bd243f447cb 100644
--- a/packages/react/src/internal/utils/__tests__/toggleStyledComponent.test.tsx
+++ b/packages/react/src/internal/utils/__tests__/toggleStyledComponent.test.tsx
@@ -5,8 +5,32 @@ import {toggleStyledComponent} from '../toggleStyledComponent'
 import styled from 'styled-components'
 
 describe('toggleStyledComponent', () => {
+  test('renders the component as `defaultAs` when flag is enabled and no `as` prop is provided', () => {
+    const TestComponent = toggleStyledComponent('testFeatureFlag', 'span', ({as: BaseComponent = 'div'}) => (
+      <BaseComponent />
+    ))
+    const {container} = render(
+      <FeatureFlags flags={{testFeatureFlag: true}}>
+        <TestComponent />
+      </FeatureFlags>,
+    )
+    expect(container.firstChild).toBeInstanceOf(HTMLSpanElement)
+  })
+
+  test('renders the component as `defaultAs` when flag is disabled and no `as` prop is provided', () => {
+    const TestComponent = toggleStyledComponent('testFeatureFlag', 'span', ({as: BaseComponent = 'div'}) => (
+      <BaseComponent />
+    ))
+    const {container} = render(
+      <FeatureFlags flags={{testFeatureFlag: false}}>
+        <TestComponent />
+      </FeatureFlags>,
+    )
+    expect(container.firstChild).toBeInstanceOf(HTMLSpanElement)
+  })
+
   test('renders the `as` prop when flag is enabled', () => {
-    const TestComponent = toggleStyledComponent('testFeatureFlag', () => <div />)
+    const TestComponent = toggleStyledComponent('testFeatureFlag', 'div', () => <div />)
     const {container} = render(
       <FeatureFlags flags={{testFeatureFlag: true}}>
         <TestComponent as="button" />
@@ -16,7 +40,7 @@ describe('toggleStyledComponent', () => {
   })
 
   test('renders a div as fallback when flag is enabled and no `as` prop is provided', () => {
-    const TestComponent = toggleStyledComponent('testFeatureFlag', () => <div />)
+    const TestComponent = toggleStyledComponent('testFeatureFlag', 'div', () => <div />)
     const {container} = render(
       <FeatureFlags flags={{testFeatureFlag: true}}>
         <TestComponent />
@@ -26,7 +50,7 @@ describe('toggleStyledComponent', () => {
   })
 
   test('renders Box with `as` if `sx` is provided and flag is enabled', () => {
-    const TestComponent = toggleStyledComponent('testFeatureFlag', () => styled.div``)
+    const TestComponent = toggleStyledComponent('testFeatureFlag', 'div', () => styled.div``)
     const {container} = render(
       <FeatureFlags flags={{testFeatureFlag: true}}>
         <TestComponent as="button" sx={{color: 'red'}} />
@@ -38,7 +62,7 @@ describe('toggleStyledComponent', () => {
   })
 
   test('renders styled component when flag is disabled', () => {
-    const StyledComponent = toggleStyledComponent('testFeatureFlag', styled.div.attrs({['data-styled']: true})``)
+    const StyledComponent = toggleStyledComponent('testFeatureFlag', 'div', styled.div.attrs({['data-styled']: true})``)
     const {container} = render(
       <FeatureFlags flags={{testFeatureFlag: false}}>
         <StyledComponent />
diff --git a/packages/react/src/internal/utils/toggleStyledComponent.tsx b/packages/react/src/internal/utils/toggleStyledComponent.tsx
index 7b366cb0eb0..5c551af11f8 100644
--- a/packages/react/src/internal/utils/toggleStyledComponent.tsx
+++ b/packages/react/src/internal/utils/toggleStyledComponent.tsx
@@ -17,12 +17,18 @@ type CSSModulesProps = {
  *
  * @param flag - the feature flag that will control whether or not the provided
  * styled component is used
+ * @param defautlAs - the default component to use when `as` is not provided
  * @param Component - the styled component that will be used if the feature flag
  * is disabled
  */
-export function toggleStyledComponent<T, P extends CSSModulesProps>(flag: string, Component: React.ComponentType<P>) {
+export function toggleStyledComponent<T, P extends CSSModulesProps>(
+  flag: string,
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  defaultAs: string | React.ComponentType<any>,
+  Component: React.ComponentType<P>,
+) {
   const Wrapper = React.forwardRef<T, P>(function Wrapper(
-    {as: BaseComponent = 'div', sx: sxProp = defaultSxProp, ...rest},
+    {as: BaseComponent = defaultAs, sx: sxProp = defaultSxProp, ...rest},
     ref,
   ) {
     const enabled = useFeatureFlag(flag)