Constance Bay is a population centre in West Carleton-March Ward in the rural northwest of the city of Ottawa, Ontario, Canada.

The community surrounds the Torbolton Forest (a protected and managed green-space) and is located on a peninsula between Constance and Buckham's Bay on the Ottawa River.

During the summer months the community offers 2 beaches, recreational boating, water skiing, canoeing, hiking, horseback riding, and cycling.

The actual bay was named by French Fur Traders after Simon Constant who was a member of the Algonquin First Nation and who was in the area before white settlers arrived.

Edwin Sowter, a hobby archaeologist from Aylmer, Quebec, first identified the presence of archaeological sites at Constance Bay in the late 1800s.