- O'Connor, Brian
- O'Neill, Donna
- O'Sullivan, Christopher
- O'Sullivan, Kathleen
- O'Sullivan Coyne, Geraldine
- Ochocinska, Malgorzata J.
- Oh, April
- Okumura, Atsushi
- Older, Stephanie
- Olive, Michelle M.
- Ono, Hiromi
- Oreilly, Julia
- Orellana, Halyn
- Ortolan, Davide
- Osafo-Mensah, Nana
- Oster, Kelli A.
- Ostrye, Carol
- Ota Wang, Vivian
- Ottinger, Elizabeth
- Otubu, Mabatemije
- Oundo, Lynn
- Outlaw, Ashlee
- Ovard, Melissa
- Ovelmen, Heather R.
- Owen, Linda
- Owens, Roland A.
- Owens, Roland
- Oyewolen, Rachael LT