Edward M. Cotter is a fireboat in use by the Buffalo Fire Department at Buffalo, New York, United States. Originally named William S. Grattan, it was built in 1900 by the Crescent Shipyard of Elizabeth Port, New Jersey. Due to age, it was rebuilt in 1953 and renamed Firefighter upon its return to service. The following year it was renamed Edward M. Cotter. its namesake, Edward Cotter, was a Buffalo firefighter and leader of the local firefighters union who had recently died.

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.