Chazy is a town in northeastern Clinton County, New York, in the United States. The population was 4,284 at the 2010 census. The closest city is Plattsburgh, 12 miles (19 km) to the south. Chazy is 8.2 miles (13.2 km) from Canada. The zip code is 12921 and it is in area code 518.
The region was explored by Samuel de Champlain in 1609. The town was first settled around 1763 by Jean Laframboise, who is also credited with introducing apple growing to the area. Chazy is named after a Lieutenant de Chézy, who was killed by the Iroquois.
Chazy was formed from the Town of Champlain in 1804; in 1853, part of the town was used to form the Town of Altona.