diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
index 0f5eeb3e70..adc3122af6 100644
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -145,6 +145,7 @@ phutil_register_library_map(array(
     'ConduitAPI_file_info_Method' => 'applications/conduit/method/file/ConduitAPI_file_info_Method.php',
     'ConduitAPI_file_upload_Method' => 'applications/conduit/method/file/ConduitAPI_file_upload_Method.php',
     'ConduitAPI_flag_Method' => 'applications/conduit/method/flag/ConduitAPI_flag_Method.php',
+    'ConduitAPI_flag_delete_Method' => 'applications/conduit/method/flag/ConduitAPI_flag_delete_Method.php',
     'ConduitAPI_flag_query_Method' => 'applications/conduit/method/flag/ConduitAPI_flag_query_Method.php',
     'ConduitAPI_macro_Method' => 'applications/conduit/method/macro/ConduitAPI_macro_Method.php',
     'ConduitAPI_macro_query_Method' => 'applications/conduit/method/macro/ConduitAPI_macro_query_Method.php',
@@ -1263,6 +1264,7 @@ phutil_register_library_map(array(
     'ConduitAPI_file_info_Method' => 'ConduitAPIMethod',
     'ConduitAPI_file_upload_Method' => 'ConduitAPIMethod',
     'ConduitAPI_flag_Method' => 'ConduitAPIMethod',
+    'ConduitAPI_flag_delete_Method' => 'ConduitAPI_flag_Method',
     'ConduitAPI_flag_query_Method' => 'ConduitAPI_flag_Method',
     'ConduitAPI_macro_Method' => 'ConduitAPIMethod',
     'ConduitAPI_macro_query_Method' => 'ConduitAPI_macro_Method',
diff --git a/src/applications/conduit/method/flag/ConduitAPI_flag_delete_Method.php b/src/applications/conduit/method/flag/ConduitAPI_flag_delete_Method.php
new file mode 100644
index 0000000000..610c129ec8
--- /dev/null
+++ b/src/applications/conduit/method/flag/ConduitAPI_flag_delete_Method.php
@@ -0,0 +1,58 @@
+<?php
+
+/*
+ * Copyright 2012 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @group conduit
+ */
+final class ConduitAPI_flag_delete_Method extends ConduitAPI_flag_Method {
+
+  public function getMethodDescription() {
+    return "Clear a flag.";
+  }
+
+  public function defineParamTypes() {
+    return array(
+      'id' => 'required id',
+    );
+  }
+
+  public function defineReturnType() {
+    return 'void';
+  }
+
+  public function defineErrorTypes() {
+    return array(
+      'ERR_NOT_FOUND'  => 'Bad flag ID.',
+      'ERR_WRONG_USER' => 'You are not the creator of this flag.',
+    );
+  }
+
+  protected function execute(ConduitAPIRequest $request) {
+    $id = $request->getValue('id');
+    $flag = id(new PhabricatorFlag())->load($id);
+    if (!$flag) {
+      throw new ConduitException('ERR_NOT_FOUND');
+    }
+    if ($flag->getOwnerPHID() != $request->getUser()->getPHID()) {
+      throw new ConduitException('ERR_WRONG_USER');
+    }
+    $flag->delete();
+    return;
+  }
+
+}