Dismal Swamp may refer to:
Australia
- Dismal Swamp, South Australia
- Dismal Swamp Regional Reserve, a protected area of Tasmania
United States
- Dismal Swamp (New Jersey), a swamp in New Jersey
- Dismal Swamp State Park, a protected area in North Carolina
- Great Dismal Swamp, near Virginia and North Carolina
- Dismal Swamp Canal, a canal in Virginia and North Carolina