diff --git a/common/changes/add-readonly-attribute_2017-05-05-13-57.json b/common/changes/add-readonly-attribute_2017-05-05-13-57.json
new file mode 100644
index 00000000000000..8355232114257d
--- /dev/null
+++ b/common/changes/add-readonly-attribute_2017-05-05-13-57.json
@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "office-ui-fabric-react",
+      "comment": "Dropdown: Add aria readonly attribute",
+      "type": "patch"
+    }
+  ],
+  "email": "hross@hross.net"
+}
\ No newline at end of file
diff --git a/packages/office-ui-fabric-react/src/components/Dropdown/Dropdown.tsx b/packages/office-ui-fabric-react/src/components/Dropdown/Dropdown.tsx
index be55124e0f82fc..07ed3de691bd36 100644
--- a/packages/office-ui-fabric-react/src/components/Dropdown/Dropdown.tsx
+++ b/packages/office-ui-fabric-react/src/components/Dropdown/Dropdown.tsx
@@ -130,6 +130,7 @@ export class Dropdown extends BaseComponent<IDropdownInternalProps, IDropdownSta
           onClick={ this._onDropdownClick }
           aria-expanded={ isOpen ? 'true' : 'false' }
           role='combobox'
+          aria-readonly={ true }
           aria-live={ disabled || isOpen ? 'off' : 'assertive' }
           aria-label={ ariaLabel || label }
           aria-describedby={ id + '-option' }