USS Dapdap (YFB-684)
 USS Dapdap (YFB-684) was a United States Navy working launch in service from 1908 to 1942.Dapdap (YFB-684) a working launch was attached to the Naval Station Cavite Philippine Islands or the 16th Naval District from 1908 to 1942. Dapdap was lost 2 January 1942 to Japanese forces during the conquest of Luzon Island. She was stricken from the Navy List on 24 July 1942.