USS Spitfire was an American gundalow that operated as a gunboat in 1776 on Lake Champlain. She was part of Benedict Arnold's small, hastily built fleet of ships whose purpose was to counter any British invasion forces passing through the lake from Canada. Her service life was brief; after only a few months patrolling the lake she was lost in the aftermath of the Battle of Valcour Island. The gunboat's wreck was located and documented in the 1990s by the Lake Champlain Maritime Museum.