diff --git a/.changeset/few-coins-kick.md b/.changeset/few-coins-kick.md
new file mode 100644
index 00000000000..4479640c18c
--- /dev/null
+++ b/.changeset/few-coins-kick.md
@@ -0,0 +1,5 @@
+---
+"@primer/react": minor
+---
+
+Deprecate use of sx prop by deprecating the `SxProp` type definition
diff --git a/packages/react/src/sx.ts b/packages/react/src/sx.ts
index 5b9a20fc011..0d11b6cc647 100644
--- a/packages/react/src/sx.ts
+++ b/packages/react/src/sx.ts
@@ -26,6 +26,7 @@ type CSSSelectorObject = {
 export type BetterSystemStyleObject = BetterCssProperties | SystemStyleObject | CSSCustomProperties | CSSSelectorObject
 
 export interface SxProp {
+  /** @deprecated Use CSS modules for styling instead */
   sx?: BetterSystemStyleObject
 }