O
- Mike O'Berry
- Charlie O'Brien
- Syd O'Brien
- Darren O'Day
- Sean O'Sullivan
- Ken Oberkfell
- Alex Ochoa
- Omar Olivares
- Bob Oliver
- Darren Oliver
- Anthony Ortega
- Phil Ortega
- Ramón Ortiz
- John Orton
- Dan Osinski
- Ed Ott
- Mike Overy
- Spike Owen
- Eric Owens
- Ray Oyler
Read more about this topic: Los Angeles Angels Of Anaheim All-time Roster