diff --git a/.changeset/tricky-mangos-nail.md b/.changeset/tricky-mangos-nail.md
new file mode 100644
index 0000000000..466c47638a
--- /dev/null
+++ b/.changeset/tricky-mangos-nail.md
@@ -0,0 +1,5 @@
+---
+"@primer/css": patch
+---
+
+Add `aria-selected` to ActionList-item for Autocomplete
diff --git a/src/actionlist/action-list-item.scss b/src/actionlist/action-list-item.scss
index 7004819d1a..b00ec659b0 100644
--- a/src/actionlist/action-list-item.scss
+++ b/src/actionlist/action-list-item.scss
@@ -115,7 +115,8 @@
 
   // active state [aria-current]
 
-  &.ActionList-item--navActive {
+  &.ActionList-item--navActive,
+  &[aria-selected='true'] {
     &:not(.ActionList-item--subItem) {
       .ActionList-item-label {
         font-weight: $font-weight-bold;