John J. Harvey is a fireboat formerly of the New York City Fire Department (FDNY) in New York City, famed for returning to service following the September 11, 2001 attacks. She is one of the most powerful fireboats ever built, capable of pumping up to 18,000 gallons of water a minute.

A fireboat or fire-float is a specialized watercraft with pumps and nozzles designed for fighting shoreline and shipboard fires. The first fireboats, dating to the late 18th century, were tugboats, retrofitted with firefighting equipment. Older designs derived from tugboats and modern fireboats more closely resembling seafaring ships can both be found in service today. Some departments would give their multi-purpose craft the title of "fireboat" also.