| Provider | Specialty | Location |
| OCEGUERA, JORGE | Family Practice | GALT |
| ODAMA, TOMIO | Internal Medicine | LODI |
| O'NEIL, THOMAS | Ophthalmology | TRACY |
| OSHTORY, MEHERJI | Neurology | STOCKTON |
| OVERTON, JOHN | Cardiac Surgery | STOCKTON |
| OVERTON, JOHN | Thoracic Surgery | STOCKTON |
