Great Ditch is a drainage ditch that drains areas of the Pigeon Swamp State Park in New Jersey in the United States.
Great Ditch starts at , in the Pigeon Swamp State Park. It flows west, crossing Fresh Ponds Road and Route 130 before joining another stream at which drains into the Lawrence Brook.
This canal's purpose is to drain sections of the Pigeon Swamp to prevent flooding of Deans Rhode Hall Road, which passes through the swamp.