Trenton is a large unincorporated community in Central Ontario in the municipality of Quinte West, Ontario, Canada. Located on the Bay of Quinte, it is the starting point for the Trent-Severn Waterway, which continues northwest to Peterborough and eventually Port Severn on Georgian Bay.

Central Ontario is a secondary region of Southern Ontario in the Canadian province of Ontario that lies between Georgian Bay and the eastern end of Lake Ontario.