diff --git a/CHANGELOG.md b/CHANGELOG.md
index 031c22f24cd..d20994dddc4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,10 @@
 * `dart:convert`
   * `Base64Decoder.convert` now takes optional `start` and `end` parameters.
 
+* `dart:io`
+  * `Platform` added an `isiOS` getter and `Platform.operatingSystem` may now
+    return `ios`.
+
 ## 1.13.0
 
 ### Core library changes
diff --git a/runtime/bin/platform_macos.cc b/runtime/bin/platform_macos.cc
index 091d093feda..0f7c62965c2 100644
--- a/runtime/bin/platform_macos.cc
+++ b/runtime/bin/platform_macos.cc
@@ -53,7 +53,11 @@ int Platform::NumberOfProcessors() {
 
 
 const char* Platform::OperatingSystem() {
+#if TARGET_OS_IOS
+  return "ios";
+#else
   return "macos";
+#endif
 }
 
 
diff --git a/runtime/vm/os_macos.cc b/runtime/vm/os_macos.cc
index aa6b9c855fe..1a338f49fcb 100644
--- a/runtime/vm/os_macos.cc
+++ b/runtime/vm/os_macos.cc
@@ -27,7 +27,11 @@
 namespace dart {
 
 const char* OS::Name() {
+#if TARGET_OS_IOS
+  return "ios";
+#else
   return "macos";
+#endif
 }
 
 
diff --git a/sdk/lib/io/platform.dart b/sdk/lib/io/platform.dart
index 56ddea0193b..c9e1cc66d6d 100644
--- a/sdk/lib/io/platform.dart
+++ b/sdk/lib/io/platform.dart
@@ -84,7 +84,7 @@ class Platform {
   static String get pathSeparator => _pathSeparator;
 
   /**
-   * Get a string (`linux`, `macos`, `windows` or `android`)
+   * Get a string (`linux`, `macos`, `windows`, `android`, or `ios`)
    * representing the operating system.
    */
   static String get operatingSystem => _operatingSystem;
@@ -114,6 +114,11 @@ class Platform {
    */
   static final bool isAndroid = (_operatingSystem == "android");
 
+  /**
+   * Returns true if the operating system is iOS.
+   */
+  static final bool isiOS = (_operatingSystem == "ios");
+
   /**
    * Get the environment for this process.
    *