- O'Brien, Kymberlee M.3
- O'Connor, John T.5
- O'Donnell, Dean Michael38
- O'Shaughnessy, James C.5
- Oates, Karen Kashmanian34
- Obien, Rodney4
- Ogilvie, Anne11
- Olinger, David J.2
- Olson, Sarah D1
- Orr, John A.38
- Ostapowicz-Critz, Lori J.2
- Ostrow, Korinn S.3
- Ottmar, Erin R6
- Overstrom, Eric W.2