YF-415 was a self-propelled covered lighter in service with the United States Navy during World War II.

It was accidentally sunk on May 11, 1944, while disposing of surplus explosive ordnance approximately 14 miles (23 km) northeast of Boston Harbor.

At 12:30 p.m., there was an explosion, caused by one of the rockets detonating, which engulfed the port side of the ship in flames which began to spread throughout the vessel.

A total of 14 men, one of whom later died of his injuries, were rescued by the patrol yacht USS Zircon, with 16 being lost with YF-415.

[4] An investigation of the incident yielded a report dated June 8, 1944, which called for improved safety protocols, including having similar missions conducted by a towed barge and making life preservers more readily accessible.