St. Peter's is a small incorporated village located on Cape Breton Island in Richmond County, Nova Scotia, Canada. This village is located on a narrow isthmus which separates the southern end of Bras d'Or Lake, known as St. Peter's Inlet, to the north from St. Peter's Bay on the Atlantic Ocean to the south. The isthmus is crossed by the St. Peters Canal which is almost exclusively used by pleasure boats in recent decades. It is home to Battery Provincial Park.