Petersfield Provincial Park is a picnic park overlooking the south arm of Sydney Harbour on Cape Breton Island (off Route 239).

The park contains remnants of four cultural periods, dating from the late 18th to mid 20th centuries. Other park features include picnic tables, interpretive signs, and an extensive network of trails (7 km/4.5 mi).

Open seasonally for winter activities although there are no facilities or services provided.