Fonda is a village in and the county seat of Montgomery County, New York, United States. The population was 668 at the 2020 census, down from 795 in 2010. The village developed at the site of a historic Mohawk settlement. It is named after Douw Fonda, a Dutch-American settler who was killed and scalped in 1780, during a Mohawk raid in the Revolutionary War. At that time the tribe was allied with the British, in the hopes of removing settlers from their territory.