diff --git a/change/@fluentui-react-accordion-447fffcd-1e24-4145-babe-49abf6bc1134.json b/change/@fluentui-react-accordion-447fffcd-1e24-4145-babe-49abf6bc1134.json
new file mode 100644
index 00000000000000..4ada44a1289295
--- /dev/null
+++ b/change/@fluentui-react-accordion-447fffcd-1e24-4145-babe-49abf6bc1134.json
@@ -0,0 +1,7 @@
+{
+  "type": "patch",
+  "comment": "fix: use empty string for inert attribute instead of boolean in AccordionPanel to prevent React DOM warning",
+  "packageName": "@fluentui/react-accordion",
+  "email": "198982749+Copilot@users.noreply.github.com",
+  "dependentChangeType": "patch"
+}
diff --git a/packages/react-components/react-accordion/library/src/components/AccordionPanel/AccordionPanel.test.tsx b/packages/react-components/react-accordion/library/src/components/AccordionPanel/AccordionPanel.test.tsx
index 9907f0538b6933..2bb99caeca159f 100644
--- a/packages/react-components/react-accordion/library/src/components/AccordionPanel/AccordionPanel.test.tsx
+++ b/packages/react-components/react-accordion/library/src/components/AccordionPanel/AccordionPanel.test.tsx
@@ -38,7 +38,7 @@ describe('AccordionPanel', () => {
       <AccordionItemProvider value={mockAccordionItemContextValue({ open: false })}>{children}</AccordionItemProvider>
     );
     const { result } = renderHook(() => useAccordionPanelBase_unstable({}, ref), { wrapper });
-    expect(result.current.root.inert).toBe(true);
+    expect(result.current.root.inert).toBe('true');
     expect(result.current.root.tabIndex).toBe(-1);
   });
 
diff --git a/packages/react-components/react-accordion/library/src/components/AccordionPanel/useAccordionPanel.ts b/packages/react-components/react-accordion/library/src/components/AccordionPanel/useAccordionPanel.ts
index d352a2df7d6be3..a456bc1160ed5f 100644
--- a/packages/react-components/react-accordion/library/src/components/AccordionPanel/useAccordionPanel.ts
+++ b/packages/react-components/react-accordion/library/src/components/AccordionPanel/useAccordionPanel.ts
@@ -73,7 +73,7 @@ export const useAccordionPanelBase_unstable = (
         // Prevent keyboard focus from entering the panel while it is closed/collapsing.
         // tabIndex: -1 prevents the panel itself from being focused, and inert prevents
         // all focusable descendants from being reachable via keyboard navigation.
-        ...(open ? {} : { tabIndex: -1, inert: true }),
+        ...((open ? {} : { tabIndex: -1, inert: 'true' }) as React.HTMLAttributes<HTMLDivElement>),
       },
       { elementType: 'div' },
     ),