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Billy may refer to:
- Billy (Fallout), a child living in the Hub in Fallout.
- Billy (Fallout 2), a patron of the Hole in the Den in Fallout 2.
- DcBilly.msg, dialogue for Billy at the Hole in Fallout 2.
- Billy Creel, an inhabitant of Megaton in Fallout 3.
- Biwwy, a child living in Little Lamplight in Fallout 3.
- Billy (Fallout 3), a Capital wastelander mentioned in Fallout 3.
- Billy (Dunwich Building), a friend of the wastelander trapped inside the Dunwich Building in Fallout 3
- Billy (The Pitt), a trog living in The Pitt's steelyard in the Fallout 3 add-on, The Pitt
- Billy McShady, a cut character found in The Pitt's game files
- Billy Knight, a street comedian living on the New Vegas Strip in Fallout: New Vegas.
- Billy Montalvo, Sr., a soldier who fought, and died, during the First Battle of Hoover Dam, mentioned in Fallout: New Vegas.
- Billy (Fallout: New Vegas), someone affiliated with Sue, mentioned in Fallout: New Vegas.
- Billy Bettis, a cut merchant, from Fallout: New Vegas.
- Billy Bob, a member of the Brotherhood of Steel, Midwest chapter, and recruit in Fallout Tactics.
- Billy-Bob, leader of the Hoover Dam trogs in Van Buren.
- Billie, one of Helen Wheels sick kids in Van Buren.
- Real-life people: