Johnsburg is a town in the northwestern corner of Warren County, New York, United States. It is part of the Glens Falls Metropolitan Statistical Area. The town population was 2,143 at the 2020 census. The town is named after John Thurman, an early settler and founder. Johnsburg is the largest town in Warren County by area.

Warren County is a county in the U.S. state of New York. As of the 2020 census, the population was 65,737. The county seat is Queensbury. The county was established in 1813 and is named in honor of General Joseph Warren, an American Revolutionary War hero of the Battle of Bunker Hill. The county is part of the Capital District region of the state.