The Municipality of the County of Richmond is a county municipality on Cape Breton Island, Nova Scotia, Canada. It provides local government to the eponymous historical county, except for the Chapel Island 5 reserve. The municipality also contains the village of St. Peter's. Municipal office are at Arichat. It is the site of St. Peters Canal. It was named for a Governor General of British North America, Charles Lennox, 4th Duke of Richmond, and created in 1835, having formerly been part of Cape Breton County.