diff --git a/.changeset/giant-games-leave.md b/.changeset/giant-games-leave.md
new file mode 100644
index 00000000000..c9bac2049f1
--- /dev/null
+++ b/.changeset/giant-games-leave.md
@@ -0,0 +1,5 @@
+---
+"@primer/react": patch
+---
+
+Add `aria-modal` attribute to `Dialog` (V2) element
diff --git a/src/Dialog/Dialog.tsx b/src/Dialog/Dialog.tsx
index 37354b6452b..be9fa186567 100644
--- a/src/Dialog/Dialog.tsx
+++ b/src/Dialog/Dialog.tsx
@@ -302,6 +302,7 @@ const _Dialog = React.forwardRef<HTMLDivElement, React.PropsWithChildren<DialogP
             role={role}
             aria-labelledby={dialogLabelId}
             aria-describedby={dialogDescriptionId}
+            aria-modal
             sx={sx}
           >
             {header}