diff --git a/Libraries/Components/ActivityIndicator/ActivityIndicator.js b/Libraries/Components/ActivityIndicator/ActivityIndicator.js
index 282960556e3174..e4d49c3085f622 100644
--- a/Libraries/Components/ActivityIndicator/ActivityIndicator.js
+++ b/Libraries/Components/ActivityIndicator/ActivityIndicator.js
@@ -40,12 +40,14 @@ const ActivityIndicator = React.createClass({
      */
     color: ColorPropType,
     /**
-     * Size of the indicator. Small has a height of 20, large has a height of 36.
+     * Size of the indicator. Small has a height of 20, medium has a height of 28, large has a height of 36, extralarge has a height of 50.
      * Other sizes can be obtained using a scale transform.
      */
     size: PropTypes.oneOf([
       'small',
+      'medium',
       'large',
+      'extralarge'
     ]),
     /**
      * Whether the indicator should hide when not animating (true by default).
@@ -71,9 +73,15 @@ const ActivityIndicator = React.createClass({
       case 'small':
         sizeStyle = styles.sizeSmall;
         break;
+      case 'medium':
+        sizeStyle = styles.sizeMedium;
+        break;
       case 'large':
         sizeStyle = styles.sizeLarge;
         break;
+      case 'extralarge':
+        sizeStyle = styles.sizeExtraLarge;
+        break;
     }
     return (
       <View
@@ -99,10 +107,18 @@ const styles = StyleSheet.create({
     width: 20,
     height: 20,
   },
+  sizeMedium: {
+    width: 28,
+    height: 28,
+  },
   sizeLarge: {
     width: 36,
     height: 36,
   },
+  sizeExtraLarge: {
+    width: 50,
+    height: 50,
+  },
 });
 
 if (Platform.OS === 'ios') {
diff --git a/Libraries/Components/ActivityIndicator/ActivityIndicatorIOS.ios.js b/Libraries/Components/ActivityIndicator/ActivityIndicatorIOS.ios.js
index 4386dc46f4cd06..5fea0822ce45cf 100644
--- a/Libraries/Components/ActivityIndicator/ActivityIndicatorIOS.ios.js
+++ b/Libraries/Components/ActivityIndicator/ActivityIndicatorIOS.ios.js
@@ -41,7 +41,9 @@ var ActivityIndicatorIOS = React.createClass({
      */
     size: PropTypes.oneOf([
       'small',
+      'medium',
       'large',
+      'extralarge',
     ]),
     /**
      * Invoked on mount and layout changes with