| Oliver Fitzgerald | |
 Oliver Fitzgerald in 2371 | |
| Full name: | Oliver Fitzgerald |
| Species: | Terran |
| Gender: | Male |
| Homeworld: | Earth |
| Birthplace: | Earth |
| Born: | 24th century |
| Died: | 2371 |
| Affiliation: | Terran Empire, Imperial Starfleet |
| Marital Status: | Single |
| Career | |
| Occupation: | Imperial Starfleet officer |
| Final Assignment: | chief medical officer, ISS Voyager |
| Rank: | Lieutenant Commander |
| Insignia: |  
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In an alternate mirror universe, Doctor Oliver Fitzgerald was a male Terran Imperial Starfleet officer who served as the original chief medical officer aboard the ISS Voyager in 2371 under the command of Kathryn Janeway.
Before serving as CMO on Voyager, he served as the CMO on the Terran outpost on Caldik Prime, where he was stationed along with Tom Paris.
The chief medical officer was one of the casualties of Voyager's transport into the Delta Quadrant by the Caretaker, along with most of the medical staff. He was replaced as CMO by The Doctor, a Emergency Medical Android who worked with him in sickbay.