| O'Brien, Richard (1) | O'Brien, Dan (1) | O'Brien, John (8) |
| O'Carroll, Dean (2) | O'Casey, Sean (3) | O'Connell, Richard (1) |
| O'Connor, John (2) | O'Donnell, Mark (1) | O'Donnell, Dean (1) |
| O'Flaherty, Michael (1) | O'Hara, John (1) | O'Keefe, Laurence (3) |
| O'Mahony, John Sean (1) | O'Malley, Mike (2) | O'Malley, Mary (1) |
| O'Neill, Rosary Hartel (10) | O'Toole, Maureen A. (1) | O'Toole, Austin (1) |
| Oates, Joyce Carol (1) | Oberacker, Richard (2) | Offenbach, Jacques (1) |
| Ogawa, Aya (1) | Ogmundson, Will (1) | Ohm, Lori Allen (1) |
| Okada, Toshiki (1) | Okimoto, Leah (1) | Okita, Dwight (1) |
| Oklahoma, D. K. (1) | Okrent, Daniel (1) | Olding, Grant (1) |
| Oler, Kim (2) | Olive, John (1) | Oliver, Ryan Scott (5) |
| Olney, Dorothy (0) | Olsen, Mark V. (1) | Olson, Phil (5) |
| Olson, Paul (2) | Omorotionmwan, Philana (1) | Opelka, Gregg (9) |
| Oppenheimer, George (1) | Organ, Scott (1) | Orlando, Dominic (1) |
| Orlock, John (1) | Orloff, Rich (4) | Ormerod, John (1) |