Castlereagh, Nova Scotia

 Castlereagh is a community in the Canadian province of Nova Scotia, located in Colchester County. It was either named after Castlereagh in Northern Ireland or Robert Stewart, Viscount Castlereagh.

Once a bustling village, only a few houses remain in Castlereagh - the only people found there now tend to be those occupying seasonal camps, typically for hunting or logging.