| Great Ditch | |
| Map: | Great Ditch.JPG |
| Source1 Coordinates: | 40.3847°N -74.4825°W |
| Mouth Coordinates: | 40.3942°N -74.5075°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Progression: | Lawrence Brook, Raritan River, Atlantic Ocean |
| Source1 Elevation: | 89feet |
| River System: | Raritan River system |
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 40.3847°N -74.4825°W,[1] in the Pigeon Swamp State Park. It flows west, crossing Fresh Ponds Road and Route 130 before joining another stream at 40.3942°N -74.5075°W[1] 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.