O'Neill or O'Neil may refer to:
- People
- O'Neil (2250s), USS Enterprise officer
- O'Neil, USS Enterprise lieutenant
- O'Neil (Chief), USS Enterprise-E crewman
- O'Neill, USS Enterprise crewman
- O'Neill (Kelvin timeline), USS Enterprise crewman
- O'Neill (MACO), MACO on the USS Thunderchild
- Donna O'Neill, gamma shift commander of the Enterprise NX-01
- Gerard O'Neill, a 20th century theoretician
- Liam O'Neill, a 22nd century admiral
- Tip O'Neill, a 20th century U.S. politician
- Locations
- O'Neill colony, a type of habitat conceived by Gerard K. O'Neill
- Starships
- USS O'Neil, a Federation Nebula-class starship
| This is a disambiguation page — a navigational aid which lists pages that might otherwise share the same title. If an article link referred you here, you might want to go back and fix it to point directly to the intended page. |