diff --git a/.changeset/two-pots-battle.md b/.changeset/two-pots-battle.md
new file mode 100644
index 00000000000..3218b1c5120
--- /dev/null
+++ b/.changeset/two-pots-battle.md
@@ -0,0 +1,5 @@
+---
+'@primer/react': minor
+---
+
+TreeView: Add `count` and `className` support for trailing actions
diff --git a/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-dark-colorblind-linux.png b/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-dark-colorblind-linux.png
index 6eb557f2cb8..905a5038918 100644
Binary files a/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-dark-colorblind-linux.png and b/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-dark-colorblind-linux.png differ
diff --git a/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-dark-dimmed-linux.png b/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-dark-dimmed-linux.png
index c261aa4af8c..0b183bfb1fd 100644
Binary files a/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-dark-dimmed-linux.png and b/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-dark-dimmed-linux.png differ
diff --git a/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-dark-high-contrast-linux.png b/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-dark-high-contrast-linux.png
index 3d1d2416920..37b061ef50e 100644
Binary files a/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-dark-high-contrast-linux.png and b/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-dark-high-contrast-linux.png differ
diff --git a/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-dark-linux.png b/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-dark-linux.png
index 6eb557f2cb8..905a5038918 100644
Binary files a/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-dark-linux.png and b/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-dark-linux.png differ
diff --git a/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-dark-tritanopia-linux.png b/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-dark-tritanopia-linux.png
index 6eb557f2cb8..905a5038918 100644
Binary files a/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-dark-tritanopia-linux.png and b/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-dark-tritanopia-linux.png differ
diff --git a/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-light-colorblind-linux.png b/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-light-colorblind-linux.png
index 3df5decf425..1eeb464bfd7 100644
Binary files a/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-light-colorblind-linux.png and b/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-light-colorblind-linux.png differ
diff --git a/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-light-high-contrast-linux.png b/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-light-high-contrast-linux.png
index efc89535b80..dab1f18c373 100644
Binary files a/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-light-high-contrast-linux.png and b/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-light-high-contrast-linux.png differ
diff --git a/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-light-linux.png b/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-light-linux.png
index 3df5decf425..1eeb464bfd7 100644
Binary files a/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-light-linux.png and b/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-light-linux.png differ
diff --git a/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-light-tritanopia-linux.png b/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-light-tritanopia-linux.png
index 3df5decf425..1eeb464bfd7 100644
Binary files a/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-light-tritanopia-linux.png and b/.playwright/snapshots/components/TreeView.test.ts-snapshots/TreeView-Trailing-Actions-light-tritanopia-linux.png differ
diff --git a/packages/react/src/TreeView/TreeView.examples.stories.tsx b/packages/react/src/TreeView/TreeView.examples.stories.tsx
index 01bfb179af2..3a60e0a20a7 100644
--- a/packages/react/src/TreeView/TreeView.examples.stories.tsx
+++ b/packages/react/src/TreeView/TreeView.examples.stories.tsx
@@ -85,6 +85,7 @@ export const TrailingActions: StoryFn = () => {
               label: 'Pull Requests',
               onClick: () => alert('Pull Requests clicked'),
               icon: GitPullRequestIcon,
+              count: 5,
             },
           ]}
         >
diff --git a/packages/react/src/TreeView/TreeView.tsx b/packages/react/src/TreeView/TreeView.tsx
index c94caefc773..ccb08352102 100644
--- a/packages/react/src/TreeView/TreeView.tsx
+++ b/packages/react/src/TreeView/TreeView.tsx
@@ -22,10 +22,11 @@ import {useTypeahead} from './useTypeahead'
 import {SkeletonAvatar} from '../SkeletonAvatar'
 import {SkeletonText} from '../SkeletonText'
 import {Dialog} from '../Dialog/Dialog'
-import {IconButton} from '../Button'
+import {Button, IconButton} from '../Button'
 import {ActionList} from '../ActionList'
 import {getAccessibleKeybindingHintString} from '../KeybindingHint'
 import {useIsMacOS} from '../hooks'
+import {Tooltip} from '../TooltipV2'
 
 // ----------------------------------------------------------------------------
 // Context
@@ -80,6 +81,8 @@ export type TreeViewSecondaryActions = {
   label: string
   onClick: () => void
   icon: Icon
+  count?: number | string
+  className?: string
 }
 
 /* Size of toggle icon in pixels. */
@@ -739,7 +742,7 @@ const TrailingAction = (props: TreeViewTrailingAction) => {
   return (
     <>
       <div id={trailingActionId} className={clsx('PRIVATE_VisuallyHidden', classes.TreeViewVisuallyHidden)}>
-        ; {shortcutText}
+        - {shortcutText}
       </div>
       <div
         className={classes.TreeViewItemTrailingAction}
@@ -751,25 +754,50 @@ const TrailingAction = (props: TreeViewTrailingAction) => {
         }
         onKeyDown={event => event.stopPropagation()}
       >
-        {items.map(({label, onClick, icon}, index) => (
-          <IconButton
-            icon={icon}
-            variant="invisible"
-            aria-label={label}
-            className={classes.TreeViewItemTrailingActionButton}
-            onClick={onClick}
-            tabIndex={-1}
-            aria-hidden={true}
-            key={index}
-            onKeyDown={() => {
-              // hack to send focus back to the tree item after the action is triggered via click
-              // this is needed because the trailing action shouldn't be focused, as it does not interact well with
-              // the focus management of TreeView
-              const parentElement = document.getElementById(itemId)
-              parentElement?.focus()
-            }}
-          />
-        ))}
+        {items.map(({label, onClick, icon, count, className}, index) => {
+          // If there is a count, we render a Button instead of an IconButton,
+          // as IconButton doesn't support displaying a count.
+          if (count) {
+            return (
+              <Tooltip key={index} text={label}>
+                <Button
+                  aria-label={label}
+                  leadingVisual={icon}
+                  variant="invisible"
+                  className={clsx(className, classes.TreeViewItemTrailingActionButton)}
+                  onClick={onClick}
+                  onKeyDown={() => {
+                    // hack to send focus back to the tree item after the action is triggered via click
+                    // this is needed because the trailing action shouldn't be focused, as it does not interact well with
+                    // the focus management of TreeView
+                    const parentElement = document.getElementById(itemId)
+                    parentElement?.focus()
+                  }}
+                  tabIndex={-1}
+                  aria-hidden={true}
+                  count={count}
+                />
+              </Tooltip>
+            )
+          }
+
+          return (
+            <IconButton
+              icon={icon}
+              variant="invisible"
+              aria-label={label}
+              className={clsx(className, classes.TreeViewItemTrailingActionButton)}
+              onClick={onClick}
+              tabIndex={-1}
+              aria-hidden={true}
+              key={index}
+              onKeyDown={() => {
+                const parentElement = document.getElementById(itemId)
+                parentElement?.focus()
+              }}
+            />
+          )
+        })}
       </div>
     </>
   )
@@ -816,12 +844,18 @@ const ActionDialog: React.FC<TreeViewActionDialogProps> = ({items, onClose}) =>
         }}
       >
         <ActionList>
-          {items.map(({label, onClick, icon: Icon}, index) => (
+          {items.map(({label, onClick, icon: Icon, count}, index) => (
             <ActionList.Item key={index} onSelect={onClick}>
               <ActionList.LeadingVisual>
                 <Icon />
               </ActionList.LeadingVisual>
               {label}
+              {count ? (
+                <ActionList.TrailingVisual>
+                  {count}
+                  <VisuallyHidden>items</VisuallyHidden>
+                </ActionList.TrailingVisual>
+              ) : null}
             </ActionList.Item>
           ))}
         </ActionList>