diff --git a/.changeset/slow-owls-report.md b/.changeset/slow-owls-report.md
new file mode 100644
index 00000000000..c572b98f1c2
--- /dev/null
+++ b/.changeset/slow-owls-report.md
@@ -0,0 +1,5 @@
+---
+"@primer/react": patch
+---
+
+ActionList: Prevent scroll when an item is selected with `Space`
diff --git a/packages/react/src/ActionList/Item.tsx b/packages/react/src/ActionList/Item.tsx
index a65a10372c6..ee6592210d7 100644
--- a/packages/react/src/ActionList/Item.tsx
+++ b/packages/react/src/ActionList/Item.tsx
@@ -229,6 +229,12 @@ export const Item = React.forwardRef<HTMLLIElement, ActionListItemProps>(
       (event: React.KeyboardEvent<HTMLLIElement>) => {
         if (disabled || inactive) return
         if ([' ', 'Enter'].includes(event.key)) {
+          if (event.key === ' ') {
+            event.preventDefault() // prevent scrolling on Space
+            // immediately reset defaultPrevented once it's job is done
+            // so as to not disturb the functions that use that event after this
+            event.defaultPrevented = false
+          }
           onSelect(event, afterSelect)
         }
       },