George Kirk Jr.
- Full Name: George Samuel "Sam" Kirk, Jr.
- Born: August 12, 2230; Riverside, Iowa, United States of America, Earth (ENT Novel: Last Full Measure)
- Species: Human
- Gender: Male
- Father: George Kirk Sr.
- Mother: Winona Kirk
- Brother: James Kirk
- Wife: Aurelan Kirk
- Son: Peter Kirk
- Two other sons
- Death: April 20, 2267; Deneva Colony (TOS: "Operation: Annihilate!")