The John Purroy Mitchel was a fireboat operated by the FDNY. She was named after former mayor of New York City, John Purroy Mitchel. Grace Drennan, niece of Fire Commissioner Thomas J. Drennan played a ceremonial role in the vessels launch on July 24, 1921. Her launch was also attended by current mayor John Francis Hylan.
The John Purroy Mitchel was the city's first fireboat powered by fuel-oil, not coal. She was 132 feet (40 m) long, and her pumps could throw 9,000 gallons per minute, at pressure of 300 pounds per square inch. One of her water cannons was mounted on top of a 26 feet (7.9 m) tower.
The new city fireboat, the John Purroy Mitchel, named in honor of the late Mayor, was launched yesterday at the plant of the Standard Shipbuilding Corporation on Shooters Island.