Nottawasaga River

The Nottawasaga River is a river in southern Ontario, Canada. Its headwaters are located on the Niagara Escarpment in the Osprey Wetlands near wareham, Ontario and in Oak Ridges Moraine. It flows through the Minesing Wetlands, recognized as a wetland of international significance (Ramsar Convention site), and empties into Nottawasaga Bay, an inlet of Georgian Bay, at Wasaga Beach, Ontario.

Fish ladders allow rainbow trout to reach spawning grounds on the upper river.

The river takes its name from the Algonquin words for "Iroquois" and "river outlet".

The Nottawasaga River is the resting home of HMS Nancy, a British trading ship during the War of 1812. It met three American battleships; the Niagara, Tigress and Scorpion. The small ship lost the battle but Lt. Miller Worsley and crew escaped Nancy. They rowed 360 miles to Fort Michilimackinac and three days later, Worsley returned with 92 men to take the Tigress and Scropion. Since her sinking, an island formed around the Nancy. The hull is now preserved in a museum at Nancy Island Historic Site which is a part of Wasaga Beach Provincial Park.