Directory of Physicians (MD/DO)
- Orhan Kaymakcalan, MD
- Orie Kaltenbaugh, MD
- Orin Atlas, MD
- Orlando Fernandez, MD
- Orlando Ricciardelli, MD
- Ormonde Mahoney, MD
- Orr Limpisvasti, MD
- Orrin Franko, MD
- Orrin Scott Swayze, MD
- Orrin Sherman, MD
- Orry Erez, MD
- Orvis Chitwood, MD
- Osama Al-Masri, MD
- Osama Elattar, MD
- Osaretin Idusuyi, MD
- Oscar Anton, MD
- Oscar Castro-Aragon, MD
- Oscar Covarrubias, MD
- Oscar Currie, MD
- Oscar Duyos, MD
- Oscar Garcia, MD
- Oscar Henderson, MD
- Oscar Noel, MD
- Oscar Phillips, MD
- Oscar Reicher, MD
- Oscar Sterle, MD
- Oscar Taunton, MD
- Oscar Vazquez, MD
- Osemwengie Enabulele, MD
- Osep Armagan, MD
- Oskar Weg, MD
- Osvaldo Eloy, MD
- Osvaldo Halphen, MD
- Osy Ndubaku, MD
- Otis Drew, MD
- Otto Ohm, MD
- Otto Schueckler, MD
- Otto Wickstrom, MD
- Ouida Brown, MD
- Oussama Abousamra, MD
- Ovind Senjalia, MD
- Owen Barmada, MD
- Owen DeWitt, MD
- Owen Hitt, MD
- Owen Keenan, MD
- Owen Kelly, MD
- Owen Logee, MD
- Owen McConville, MD
- Owen McGonigle, MD
- Owen McIvor, MD