- Obesity Hypertension Clinic: Reversing the Negative Cardiovascular Effects of Weight (ReNEW) - Tammy Brady, M.D., Ph.D.
- O'Connor Lab - Daniel O'Connor, Ph.D., M.A.
- Ocular Motor Physiology Laboratory - David Zee, M.D.
- Older Americans Independence Center - Jeremy Walston, M.D.
- O'Rourke Lab - Brian O'Rourke, Ph.D.
- Outcomes After Critical Illness and Surgery Group - Dale Needham, M.D., Ph.D.