Chateaugay or Châteauguay may refer to:
- Chateaugay (village), New York
- Chateaugay (town), New York
- Châteaugay, a commune of the Puy-de-Dôme Department in France
- Châteauguay, a city southwest of Montreal
- Chateaugay (horse) (1960–1985), American Thoroughbred racehorse
- Châteauguay River, New York and Quebec