Sewer can refer to the following:
- Sewer Waystation - A location in Fallout 3.
- Sewer - Named Sewer in-game, a metro tunnel and sewer system located between and used as link between the districts of Pennsylvania Avenue and Seward Square.
- Tepid Sewers - A sewer system inhabited by Mole Rats and Raiders, and can be visited as part of The Wasteland Survival Guide quest.
- Dry Sewer - A metro tunnel and sewer system in Dupont Circle.
- Old Olney Sewers - A sewer system located in the abandoned town of Old Olney.
- Sunken Sewer - A small underground location in Dupont Circle.