San Felipe (YFB-12) (ex-Engineer) was a United States Army steel tugboat that later served as a ferryboat in the U.S. Navy and as an Imperial Japanese Army transport during World War II.

She was completed in 1907 at the Hong Kong shipyard of Hong Kong & Whampoa Dock Company for the benefit of the United States Army as the steel tugboat, Engineer.

[1][3] On 28 December 1917, she was transferred to the United States Navy and assigned to the United States Asiatic Fleet, 16th Naval District[1][2][4] but then returned to the U.S. Army in 1919.

[1] On 9 October 1922, she was transferred back to the U.S. Navy, 16th Naval District[1] to replace the Callao (YFB-11).

[5] On 10 December 1941, she was assigned to the Inshore Patrol and survived the bombing of Cavite Naval Yard and on 8 April 1942, she assisted in the evacuation of personnel from the Mariveles Naval Section Base to Corregidor during the Battle of Bataan.