diff --git a/.changeset/yellow-kings-cut.md b/.changeset/yellow-kings-cut.md
new file mode 100644
index 000000000..e8b044276
--- /dev/null
+++ b/.changeset/yellow-kings-cut.md
@@ -0,0 +1,5 @@
+---
+"@itwin/presentation-hierarchies-react": patch
+---
+
+`TreeActionBase`: Made the `onClick` prop optional.
diff --git a/packages/hierarchies-react/api/presentation-hierarchies-react-extract.api.md b/packages/hierarchies-react/api/presentation-hierarchies-react-extract.api.md
index 7e55b7ed3..a8196daa0 100644
--- a/packages/hierarchies-react/api/presentation-hierarchies-react-extract.api.md
+++ b/packages/hierarchies-react/api/presentation-hierarchies-react-extract.api.md
@@ -224,7 +224,7 @@ export interface TreeActionBaseAttributes {
 
 // @alpha (undocumented)
 type TreeActionBaseProps = Omit<ComponentPropsWithoutRef<typeof Tree.ItemAction>, "onClick"> & TreeActionBaseAttributes & {
-    onClick: () => void;
+    onClick?: () => void;
 };
 
 // @alpha
diff --git a/packages/hierarchies-react/src/presentation-hierarchies-react/stratakit/TreeAction.tsx b/packages/hierarchies-react/src/presentation-hierarchies-react/stratakit/TreeAction.tsx
index 913ae4d75..f86e8ae42 100644
--- a/packages/hierarchies-react/src/presentation-hierarchies-react/stratakit/TreeAction.tsx
+++ b/packages/hierarchies-react/src/presentation-hierarchies-react/stratakit/TreeAction.tsx
@@ -35,7 +35,7 @@ export interface TreeActionBaseAttributes {
 export type TreeActionBaseProps = Omit<ComponentPropsWithoutRef<typeof Tree.ItemAction>, "onClick"> &
   TreeActionBaseAttributes & {
     /** Callback invoked when the action is clicked. */
-    onClick: () => void;
+    onClick?: () => void;
   };
 
 /**