Kempenfelt Bay is a 14.5 km long bay that leads into the Canadian city of Barrie, Ontario. It is as deep as 30 m in places, and is connected to the larger Lake Simcoe. It is known for its ice fishing and legends of Kempenfelt Kelly, a Loch Ness monster style prehistoric creature.
Kempenfelt Bay was named by John Graves Simcoe, the Lieutenant-Governor of Upper Canada, likely for Richard Kempenfelt, who was a Royal Navy Captain in the West Indies during the 1740s, at which time and place Lieutenant-Governor Simcoe's father Captain John Simcoe, also served.