The Ducktrap River is a river in Waldo County, Maine. From the outflow in Tilden Pond (44°21′41″N 69°06′16″W / 44.3615°N 69.1044°W) in Belmont, the river runs 10.0 miles (16.1 km) southeast, through Camden Hills State Park, to West Penobscot Bay in Lincolnville.