- O'Boyle, Joseph Paul1
- O'Leary, Jason E.1
- O'Neill, Katherine Lee1
- Odom, Justin1
- Oglesby, Frank Edward1
- Olson, Christopher J.1
- Onario, Randy G.1
- Onder, Serra Beysun1
- Onorato, Gregory Bullard1
- Orfan, Kyle Joseph1
- Ortega, Solomon Phoenix1
- Ouimet, Marc Peter1