diff --git a/src/lib/chips/chip-list.ts b/src/lib/chips/chip-list.ts
index 35d7ddfb7f70..2487f9cd1c17 100644
--- a/src/lib/chips/chip-list.ts
+++ b/src/lib/chips/chip-list.ts
@@ -45,6 +45,7 @@ import {coerceBooleanProperty} from '@angular/cdk/coercion';
   host: {
     '[attr.tabindex]': '_tabIndex',
     'role': 'listbox',
+    'aria-orientation': 'horizontal',
     'class': 'mat-chip-list',
 
     '(focus)': 'focus()',