Billy could refer to:
- People
- Billy (Starfleet), a Starfleet officer from the Enterprise (NX-01)
- Billy (trooper), a soldier that fought in the Dominion War
- Billy Anderson, a miner at the Pergium Production Station on Janus VI
- Billy Claiborne, a human at the O.K. Corral
- Billy Clanton, another human that was at the O. K. Corral
- Planets
- Billybob, a planet in the Phi Unicornis system
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