- Oates, John A., M.D.
Thomas F Frist, Senior Professor of Medicine (Clinical Pharmacology); Professor of Pharmacology; Chair Emeritus of the Department of Medicine; Researcher
- Ochieng, Josiah, Ph.D.
Professor of Cancer Biology, Meharry Medical College; Researcher
- Ohi, Melanie D., Ph.D.
Associate Professor of Cell and Developmental Biology; Researcher
- Ohi, Ryoma, Ph.D.
Associate Professor of Cell and Developmental Biology; Cell Biology Researcher
- Oluwole, Olalekan, M.B.B.S., M.P.H.
Assistant Professor of Medicine; Hematologist/Oncologist
- Omary, Reed A., M.D., M.S.
Carol D. & Henry P. Pendergrass Professor and Chair, Dept of Radiology and Radiological Sciences; Chair, Department of Radiology & Radiological Sciences; Interventional Radiologist
- Osheroff, Neil, Ph.D.
John Coniglio Professor of Biochemistry; Professor of Medicine; Researcher
- Ossoff, Robert H., M.D.
Assistant Vice-Chancellor for Compliance and Corporate Integrity; Maness Professor of Laryngology and Voice; Head and Neck Surgical Oncologist
- Osteen, Kevin G., Ph.D.
Pierre Soupart Professor of Obstetrics and Gynecology; Director, Women's Reproductive Health and Research Center; Adjunct Professor of Obstetrics and Gynecology at Meharry Medical College; Researcher