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 United States Asiatic Fleet at Naval Station, Cavite, Philippine Islands,^[1] 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 earned one battle star.

She was stricken from the Navy List on 24 July 1942.

•  This article incorporates text from the public domain Dictionary of American Naval Fighting Ships. The entry can be found here.
• Priolo, Gary P.; Wright, David L. "Dapdap (YFB-684) ex-YFB-684 (1920 - 1921) Working Launch No. 684 (1908 - 1920)". NavSource - Naval Source History. Retrieved March 26, 2020.