diff --git a/flag.api.php b/flag.api.php
index 259e37a..3052c3f 100644
--- a/flag.api.php
+++ b/flag.api.php
@@ -70,6 +70,19 @@ function hook_flag_alter(&$flag) {
 }
 
 /**
+ * Allows other modules to modify the list of available flags
+ * prior to type/user filtering performed by flag_get_flags().
+ *
+ * @param array $flags
+ *   An array of available flag objects indexed by flag name.
+ *
+ * @see flag_get_flags()
+ */
+function hook_flag_get_flags($flags) {
+
+}
+
+/**
  * Alter a flag's default options.
  *
  * Modules that wish to extend flags and provide additional options must declare
diff --git a/flag.module b/flag.module
index 5c26b7a..ef64404 100644
--- a/flag.module
+++ b/flag.module
@@ -1826,7 +1826,16 @@ function flag_get_flags($entity_type = NULL, $content_subtype = NULL, $account =
   }
 
   // Make a variable copy to filter types and account.
-  $filtered_flags = $flags;
+  $filtered_flags = array();
+  foreach ($flags as $name => $flag) {
+    $filtered_flags[$name] = clone $flag;
+  }
+
+  // Let other modules modify our copy of the flags array prior to filtering.
+  foreach (module_implements('flag_get_flags') as $module) {
+    $function = $module . '_flag_get_flags';
+    $function($filtered_flags);
+  }
 
   // Filter out flags based on type and subtype.
   if (isset($entity_type) || isset($content_subtype)) {