North Grenville is a township in eastern Ontario, Canada, in the United Counties of Leeds and Grenville on the Rideau River. It is located just south of Ottawa in Canada's National Capital Region.

The Rideau River is a river in Eastern Ontario, Canada. The river flows north from Upper Rideau Lake and empties into the Ottawa River at the Rideau Falls in Ottawa, Ontario. Its length is 146 kilometres (91 mi).