- O'Keefe, Brian M1
- O'Sullivan, Karen Anne1
- O'Toole, Sean Michael1
- Ogasian, Jason R.1
- Olecki, Daniel1
- Olecki, Daniel Joseph1
- Onderdonk, Jeffrey D.1
- Orme-Johnson, McGhee1
- Orso, Dericc Andrew1
- Orton, Alix R1
- Otuyelu, Olusope M.1
- Owens, William R.1
- Ozil, Ipek1