diff --git a/.changeset/witty-kangaroos-beg.md b/.changeset/witty-kangaroos-beg.md
new file mode 100644
index 00000000000..cc7274ede9b
--- /dev/null
+++ b/.changeset/witty-kangaroos-beg.md
@@ -0,0 +1,5 @@
+---
+'@primer/react': patch
+---
+
+Bugfix: Dialog.Header ignored the sx provided
diff --git a/src/Dialog/Dialog.tsx b/src/Dialog/Dialog.tsx
index aa00fed479f..705dd443ca3 100644
--- a/src/Dialog/Dialog.tsx
+++ b/src/Dialog/Dialog.tsx
@@ -342,6 +342,7 @@ const Header = styled.div<SxProp>`
   padding: ${get('space.2')};
   z-index: 1;
   flex-shrink: 0;
+  ${sx};
 `
 
 const Title = styled.h1<SxProp>`