G
F. Drew Gaffney, M.D. — STS-40
Yuri Gagarin (1934–1968) — Vostok 1. First person in space.
Ronald Garan — STS-124, Soyuz TMA-21
Dale Gardner — STS-8, STS-51-A
Guy Gardner — STS-27, STS-35
Marc Garneau — STS-41-G, STS-77, STS-97
Owen Garriott — Skylab 3, STS-9
Charles Gemar — STS-38, STS-48, STS-62
Michael Gernhardt — STS-69, STS-83, STS-94, STS-104
Alexander Gerst — No flights.
Edward Gibson — Skylab 4
Robert L. Gibson — STS-41-B, STS-61-C, STS-27, STS-47, STS-71
Yuri Gidzenko — Soyuz TM-22, Soyuz TM-31/STS-102, Soyuz TM-34/Soyuz TM-33
Ed Givens (1930–1967) — No flights. NASA group 5.
Yuri Glazkov (1939–2008) — Soyuz 24
John Glenn — Mercury 6, STS-95
Linda Godwin — STS-37, STS-59, STS-76, STS-108
Michael T. Good — STS-125, STS-132
Viktor Gorbatko — Soyuz 7, Soyuz 24, Soyuz 37/36
Richard Gordon — Gemini 11, Apollo 12
Dominic Gorie — STS-91, STS-99, STS-108, STS-123
Ronald Grabe — STS-51-J, STS-30, STS-42, STS-57
Duane Graveline, M.D. — No flights
Georgi Grechko — Soyuz 17, Soyuz 26/27, Soyuz T-14/13
Frederick Gregory — STS-51-B, STS-33, STS-44
William Gregory — STS-67
Stanley Griggs (1939–1989) — STS-51-D
Virgil Grissom (1926–1967) — Mercury-Redstone 4, Gemini 3. Died in the Apollo 1 fire.
John Grunsfeld — STS-67, STS-81, STS-103, STS-109, STS-125
Aleksei Gubarev — Soyuz 17, Soyuz 28
Umberto Guidoni — STS-75, STS-100
Zhugderdemidiyn Gurragcha — Soyuz 39
Sidney Gutierrez — STS-40, STS-59Read more about this topic: List Of Astronauts By Name