The Green Swamp is a swamp in Florida. It lies west of Highway 27 in Polk, Lake, Sumter, Hernando and Pasco Counties. The headwaters of the Peace River, Withlacoochee River, Ocklawaha River, and Hillsborough River are located here.
Some 110,000 acres of the swamp are managed as the Green Swamp Wilderness Preserve by the Southwest Florida Water Management District.