Gary Mitchell
- Full Name: Gary Mitchell
- Species: Human
- Gender: Male
- 2261: Lieutenant, alpha shift navigator, Starfleet; USS Sacagawea (TOS Novel: The Captain's Oath)
- Late January 2262: Medical leave; Argelius II (TOS Novel: The Captain's Oath)
- Following injuries incurred in conflict with Agni cylinder ships (TOS Novel: The Captain's Oath)
- February 2262: Lieutenant, alpha shift navigator, Starfleet; USS Anggitay (TOS Novel: The Captain's Oath)
- January 2265: Lieutenant commander, alpha shift navigator, second officer, Starfleet; USS Enterprise (TOS: "Where No Man Has Gone Before")
- Death: September 23, 2265; Delta Vega (TOS: "Where No Man Has Gone Before")
- Killed by James Kirk following encounter with the Galactic Barrier (TOS: "Where No Man Has Gone Before")