diff --git a/src/internationalization/PhutilTranslator.php b/src/internationalization/PhutilTranslator.php
--- a/src/internationalization/PhutilTranslator.php
+++ b/src/internationalization/PhutilTranslator.php
@@ -160,6 +160,13 @@
         }
         return $plural;
 
+      case 'ko_KR':
+        list($singular, $plural) = $translations;
+        if ($variant == 1) {
+          return $singular;
+        }
+        return $plural;
+
       default:
         throw new Exception(pht("Unknown language '%s'.", $this->language));
     }
diff --git a/src/internationalization/locales/PhutilKoreanLocale.php b/src/internationalization/locales/PhutilKoreanLocale.php
new file mode 100644
--- /dev/null
+++ b/src/internationalization/locales/PhutilKoreanLocale.php
@@ -0,0 +1,16 @@
+<?php
+
+/**
+ * The Korean (Republic of Korea) Locale
+ */
+final class PhutilKoreanLocale extends PhutilLocale {
+
+  public function getLocaleCode() {
+    return 'ko_KR';
+  }
+
+  public function getLocaleName() {
+    return pht('Korean (Republic of Korea)');
+  }
+
+}