This is an alphabetical list of astronauts, people selected to train for a human spaceflight program to command, pilot, or serve as a crew member of a spacecraft.

For a list of everyone who has flown in space, see List of space travelers by name.

More than 600 people have been trained as astronauts. Until recently, astronauts were sponsored and trained exclusively by governments, either by the military or by civilian space agencies. However, with the advent of suborbital flight starting with privately funded SpaceShipOne in 2004, a new category of astronaut was created: the commercial astronaut.

While the term astronaut is sometimes applied to anyone who trains for travel into space—including scientists, politicians, journalists, and tourists—this article lists only professional astronauts, those who have been selected to train professionally. This includes national space programs, industry and commercial space programs which train and/or hire their own professional astronauts.

The flags indicate the astronaut's primary citizenship during their time as an astronaut. The symbol identifies female astronauts. The symbol △ indicates astronauts who have left low Earth orbit. The symbol ▲ indicates astronauts who have walked on the Moon. The symbol † indicates astronauts who have died in incidents related to a space program. __NOTOC__

A Joseph M. Acaba (1967–) — STS-119, Soyuz TMA-04M, Soyuz MS-06 Loren Acton (1936–) — STS-51-F Mike Adams (1930–1967) † — Died during X-15 Flight 191 when he lost control and his aircraft broke up. James Adamson (1946–) — STS-28, STS-43 Viktor M. Afanasyev — Soyuz TM-11, Soyuz TM-18, Soyuz TM-29, Soyuz TM-33/32 Aydyn Aimbetov — Soyuz TMA-18M Thomas Akers — STS-41, STS-49, STS-61, STS-79

Vladimir Aksyonov — Soyuz 22, Soyuz T-2 Buzz Aldrin △▲ — Gemini 12, Apollo 11. Second person to walk on the Moon. Aleksandar Panayotov Aleksandrov — Soyuz TM-5 Aleksandr Pavlovich Aleksandrov — Soyuz T-9, Soyuz TM-3 Ali AlQarni — Axiom Mission 2 Andrew M. Allen — STS-46, STS-62, STS-75 Joseph P. Allen — STS-5, STS-51-A Michael Alsbury † — Commercial astronaut, died when the VSS Enterprise broke up during a test flight. Christopher Altman — NASA-trained commercial astronaut, Association of Spaceflight Professionals 2011 Scott Altman — STS-90, STS-106, STS-109, STS-125 Pablo Álvarez Fernández — No flights. 2022 ESA Astronaut group. William Anders (1933–2024) △ — Apollo 8 Clayton Anderson — STS-117/120, STS-131 Michael P. Anderson (1959–2003) † — STS-89. Died in the Space Shuttle Columbia disaster when it disintegrated during re-entry (STS-107).

(Claudie André-Deshays – see Claudie Haigneré) Dominic A. Antonelli — STS-119, STS-132 Jerome Apt — STS-37, STS-47, STS-59, STS-79 Lee Archambault — STS-117, STS-119 Neil Armstrong (1930–2012) △▲ — Gemini 8, Apollo 11. First person to walk on the Moon. Anousheh Ansari — Soyuz TMA-9 Hayley Arceneaux — Inspiration4 Oleg Artemyev — Soyuz TMA-12M, Soyuz MS-08, Soyuz MS-21 Richard R. Arnold — STS-119, Soyuz MS-08 Anatoly Artsebarsky — Soyuz TM-12 Yuri Artyukhin (1930–1998) — Soyuz 14 Jeffrey Ashby — STS-93, STS-100, STS-112 Oleg Atkov — Soyuz T-10/11 Toktar Aubakirov — Soyuz TM-13/12 Serena M. Auñón-Chancellor — Soyuz MS-09, Expedition 56/57 Sergei Avdeyev — Soyuz TM-15, Soyuz TM-22 Nichole Ayers — SpaceX Crew-10

B James P. Bagian, M.D. — STS-29, STS-40 Ellen S. Baker, M.D. — STS-34, STS-50, STS-71 Michael Baker — STS-43, STS-52, STS-68, STS-81 Aleksandr Balandin — Soyuz TM-9 Michael R. Barratt, M.D. — Soyuz TMA-14, STS-133, SpaceX Crew-8 Rayyanah Barnawi — Axiom Mission 2 Kayla Barron— SpaceX Crew-3 Daniel Barry — STS-72, STS-96, STS-105 John-David F. Bartoe — STS-51-F Charlie Bassett (1931–1966) — No flights. Originally assigned to Gemini 9. Yuri Baturin — Soyuz TM-28/27, Soyuz TM-32/31 Patrick Baudry — STS-51-G Alan Bean (1932–2018) △▲ — Apollo 12, Skylab 3 Robert L. Behnken — STS-123, STS-130, Crew Dragon Demo-2 Ivan Bella — Soyuz TM-29/28 Pavel Belyayev (1925–1970) — Voskhod 2 Katherine Bennell-Pegg — No flights Georgi Beregovoi (1921–1995) — Soyuz 3 Anatoli Berezovoy (1942–2014) — Soyuz T-5/7 Brian Binnie — SpaceShipOne flight 17P John Blaha — STS-29, STS-33, STS-43, STS-58, STS-79/81 Michael J. Bloomfield — STS-86, STS-97, STS-110 Guion Bluford — STS-8, STS-61-A, STS-39, STS-53 Karol Bobko (1937–2023) — STS-6, STS-51-D, STS-51-J Eric A. Boe — STS-126, STS-133 Charles Bolden — STS-61-C, STS-31, STS-45, STS-60 Roberta Bondar, M.D. — STS-42 Valentin Bondarenko (1937–1961) † — No flights. Died from a training-related fire accident. Andrei Borisenko — Soyuz TMA-21, Soyuz MS-02 Konstantin Borisov — SpaceX Crew-7 Frank Borman (1928–2023) △ — Gemini 7, Apollo 8 Stephen G. Bowen — STS-126, STS-132, STS-133, SpaceX Crew-6 Kenneth Bowersox — STS-50, STS-61, STS-73, STS-82, STS-113/Soyuz TMA-1 Charles E. Brady Jr., M.D. (1951–2006) — STS-78 Vance Brand — Apollo–Soyuz Test Project, STS-5, STS-41-B, STS-35 Daniel Brandenstein — STS-8, STS-51-G, STS-32, STS-49 Randolph Bresnik — STS-129, Soyuz MS-05 Roy Bridges — STS-51-F Curtis Brown — STS-47, STS-66, STS-77, STS-85, STS-95, STS-103 David M. Brown (1956–2003) † — Died in the Columbia reentry disintegration (STS-107) Mark Brown — STS-28, STS-48 James Buchli — STS-51-C, STS-61-A, STS-29, STS-48 Jay C. Buckey, M.D. — STS-90 Nikolai Budarin — STS-71/Soyuz TM-21, Soyuz TM-27, STS-113/Soyuz TMA-1 John S. Bull (1934–2008) — No flights. Daniel Burbank — STS-106, STS-115, Soyuz TMA-22 Daniel Bursch — STS-51, STS-68, STS-77, STS-108/111 Valery Bykovsky (1934–2019) — Vostok 5, Soyuz 22, Soyuz 31/29

C Robert D. Cabana — STS-41, STS-53, STS-65, STS-88 Yvonne Cagle, M.D. — No flights. Cai Xuzhe — Shenzhou 14, Shenzhou 19 Fernando Caldeiro (1958–2009) — No flights. Charles Camarda — STS-114 Kenneth D. Cameron — STS-37, STS-56, STS-74 Zena Cardman — SpaceX Crew-11 Duane G. Carey — STS-109 Scott Carpenter (1925–2013) — Mercury 7 Gerald Carr (1932–2020) — Skylab 4 Sonny Carter, M.D. (1947–1991) — STS-33 John Casper — STS-36, STS-54, STS-62, STS-77 Josh Cassada — SpaceX Crew-5 Christopher Cassidy — STS-127, Soyuz TMA-08M, Soyuz MS-16 Robert J. Cenker — STS-61-C Eugene Cernan (1934–2017) △▲ — Gemini 9A, Apollo 10, Apollo 17 Roger B. Chaffee (1935–1967) † — Died in the Apollo 1 fire accident. Gregory Chamitoff — STS-124/126, STS-134 Franklin Chang-Diaz — STS-61-C, STS-34, STS-46, STS-60, STS-75, STS-91, STS-111 Philip K. Chapman — No flights. Raja Chari — SpaceX Crew-3 Kalpana Chawla (1961–2003) † — STS-87. Died in the Columbia reentry disintegration (STS-107). Maurizio Cheli — STS-75 Chen Dong — Shenzhou 11, Shenzhou 14, Shenzhou 20. Chen Quan — No flights. Backup for Shenzhou 7. Chen Zhongrui — Shenzhou 20 Leroy Chiao — STS-65, STS-72, STS-92, Soyuz TMA-5 Kevin P. Chilton — STS-49, STS-59, STS-76 Jean-Loup Chrétien — Soyuz T-6, Soyuz TM-7/6, STS-86 Nikolai Chub — Soyuz MS-24/MS-25 Laurel B. Clark, M.D. (1961–2003) † — Died in the Columbia reentry disintegration (STS-107) Mary L. Cleave (1947–2023) — STS-61-B, STS-30 Jean-François Clervoy, EAC — STS-66, STS-84, STS-103 Michael R. Clifford (1952–2021) — STS-53, STS-59, STS-76 Michael Coats — STS-41-D, STS-29, STS-39 Kenneth Cockrell — STS-56, STS-69, STS-80, STS-98, STS-111 Catherine Coleman — STS-73, STS-93, Soyuz TMA-20 Eileen Collins — STS-63, STS-84, STS-93, STS-114 Michael Collins (1930–2021) △ — Gemini 10, Apollo 11 Charles "Pete" Conrad (1930–1999) △▲ — Gemini 5, Gemini 11, Apollo 12, Skylab 2 Gordon Cooper (1927–2004) — Mercury 9, Gemini 5 Richard O. Covey — STS-51-I, STS-26, STS-38, STS-61 Timothy Creamer — Soyuz TMA-17 John O. Creighton — STS-51-G, STS-36, STS-48 Robert Crippen — STS-1, STS-7, STS-41-C, STS-41-G Samantha Cristoforetti — Soyuz TMA-15M, SpaceX Crew-4 Roger K. Crouch — STS-83, STS-94 Frank L. Culbertson Jr. — STS-38, STS-51, STS-105/108 Walter Cunningham (1932–2023)— Apollo 7 Robert Curbeam — STS-85, STS-98, STS-116 Nancy J. Currie — STS-57, STS-70, STS-88, STS-109

D Bill Dana (1930–2014) — X-15 flights 174 and 197 Nancy Jan Davis — STS-47, STS-60, STS-85 Lawrence J. DeLucas — STS-50 Frank De Winne — Soyuz TMA-1/TM-34, Soyuz TMA-15 Deng Qingming — Shenzhou 15 Vladimir N. Dezhurov — Soyuz TM-21/STS-71 Georgi Dobrovolski (1928–1971) † — Died in the Soyuz 11 reentry depressurisation Takao Doi — STS-87, STS-123 Matthew Dominick — SpaceX Crew-8 B. Alvin Drew — STS-118, STS-133 Pyotr Dubrov — Soyuz MS-18, Soyuz MS-19 Brian Duffy — STS-45, STS-57, STS-72, STS-92 Charles Duke △▲ — Apollo 16 Bonnie J. Dunbar — STS-61-A, STS-32, STS-50, STS-71, STS-89 Alexander Dunlap — APS STS-90 Pedro Duque — STS-95, Soyuz TMA-3/2 Samuel T. Durrance (1943–2023) — STS-35, STS-67 James Dutton — STS-131 Lev Dyomin (1926–1998) — Soyuz 15 Tracy Caldwell Dyson — STS-118, Soyuz TMA-18, Soyuz MS-25 Vladimir Dzhanibekov — Soyuz 27/26, Soyuz 39, Soyuz T-6, Soyuz T-12, Soyuz T-13

E Joe Edwards — STS-89 Donn F. Eisele (1930–1987) — Apollo 7 Anthony W. England — STS-51-F Joe H. Engle (1932–2024) — X-15 flights 138, 143, and 153, STS-2, STS-51-I Jeanette J. Epps — SpaceX Crew-8 Ronald Evans (1933–1990) △ — Apollo 17 Reinhold Ewald — Soyuz TM-25/24 Léopold Eyharts, EAC — Soyuz TM-27/26, STS-122/123 / Eiman Jahangir—Sub-orbital spaceflight

F John Fabian — STS-7, STS-51-G Muhammed Faris — Soyuz TM-3/2 Bertalan Farkas — Soyuz 36/35 Jean-Jacques Favier — STS-78 Andrey Fedyaev — SpaceX Crew-6 Fei Junlong — Shenzhou 6, Shenzhou 15 Konstantin Feoktistov (1926–2009) — Voskhod 1 Christopher Ferguson — STS-115, STS-126, STS-135 Martin J. Fettman — STS-58 Andrew J. Feustel — STS-125, STS-134, Soyuz MS-08 Anatoly Filipchenko — Soyuz 7, Soyuz 16 Michael Fincke — Soyuz TMA-4, Soyuz TMA-13, STS-134, SpaceX Crew-11 John L. Finley (1935–2006) — No flights. Trained for the MOL program. Jack D. Fischer — Soyuz MS-04 Anna Lee Fisher, M.D. — STS-51-A William Frederick Fisher, M.D. — STS-51-I Klaus-Dietrich Flade — Soyuz TM-14/13 Michael Foale — STS-45, STS-56, STS-63, STS-84/86, STS-103, Soyuz TMA-3 Kevin A. Ford — STS-128, Soyuz TMA-06M Michael Foreman — STS-123, STS-129 Patrick Forrester — STS-105, STS-117, STS-128 Michael Fossum — STS-121, STS-124, Soyuz TMA-02M Ted Freeman (1930–1964) — No flights Stephen Frick — STS-110, STS-122 Dirk Frimout — STS-45 Christer Fuglesang — STS-116, STS-128 Gordon Fullerton (1936–2013) — STS-3, STS-51-F Reinhard Furrer (1940–1995) — STS-61-A Satoshi Furukawa — Soyuz TMA-02M, SpaceX Crew-7

G F. Drew Gaffney, M.D. — STS-40 Yuri Gagarin (1934–1968)† — Vostok 1. First person in space. Died in a training flight. Ronald Garan — STS-124, Soyuz TMA-21 Dale Gardner (1948–2014) — STS-8, STS-51-A Guy Gardner — STS-27, STS-35 Sara García Alonso — No flights. 2022 ESA Astronaut group. Marc Garneau — STS-41-G, STS-77, STS-97 Owen Garriott (1930–2019) — Skylab 3, STS-9 Charles Gemar — STS-38, STS-48, STS-62 Michael Gernhardt — STS-69, STS-83, STS-94, STS-104 Alexander Gerst — Soyuz TMA-13M, Soyuz MS-09 Alper Gezeravcı — Axiom Mission 3 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 Sarah Gillis — Polaris Dawn Ed Givens (1930–1967) — No flights. NASA group 5. Yuri Glazkov (1939–2008) — Soyuz 24 John Glenn (1921–2016) — Mercury 6, STS-95 Victor Glover △ — SpaceX Crew-1, Artemis II 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 Aleksandr Gorbunov — SpaceX Crew-9 Richard Gordon (1929–2017) △ — 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. (1931–2016) — No flights Alexander Grebenkin — SpaceX Crew-8