diff -u b/src/Plugin/migrate/source/d7/Flagging.php b/src/Plugin/migrate/source/d7/Flagging.php
--- b/src/Plugin/migrate/source/d7/Flagging.php
+++ b/src/Plugin/migrate/source/d7/Flagging.php
@@ -38,6 +38,11 @@
       'global',
     ]);
 
+    // If a flag type is provided, only migrate flaggings for that flag.
+    if (isset($this->configuration['flag_type'])) {
+      $query->condition('f.name', $this->configuration['flag_type']);
+    }
+
     $query->orderBy('fi.timestamp');
 
     return $query;