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This is an alphabetical list of astronauts, people trained by a human spaceflight program to command, pilot, or serve as a crew member of a spacecraft. Until recently, astronauts were sponsored and trained exclusively by governments, either by the military or by civilian space agencies. However, with the first sub-orbital flight of the 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 travels into space, including scientists, politicians, journalists, and tourists, this article only lists professional astronauts. A list of everyone who has flown in space can be found at List of space travelers by name.
Names in italic are astronauts who have left Low Earth orbit, names in bold are astronauts who have walked on the moon.
The flags indicate citizenship during time as an astronuat. As of 2008, more than 480 people had trained as astronauts.
Contents: Top - 0–9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
 Joseph M. Acaba, first Puerto Rican astronaut.- Loren Acton
- Mike Adams (1930–1967) X-15
- James Adamson
 / Viktor M. Afanasyev- Thomas Akers
 Toyohiro Akiyama, the first business-sponsored space traveler.- Vladimir Aksyonov
- Buzz Aldrin (born 1930), flew on Apollo 11 and was the second person to walk on the Moon.
 Aleksandr Panayotov Aleksandrov- Aleksandr Pavlovich Aleksandrov
- Andrew M. Allen
- Joseph P. Allen
- Scott Altman
- William Anders
- Clayton Anderson
- *Michael P. Anderson, (1959–2003), died in the Space Shuttle Columbia disaster.
- Jerome Apt
- Lee Archambault
- Neil Armstrong (born 1930), flew on Apollo 11 and was the first person to walk on the Moon.
- /
 Anatoly Artsebarsky
- Yuri Artyukhin (1930–1998)
- Jeffrey Ashby
- Oleg Atkov
- Toktar Aubakirov, first Kazakh born person in space.
- Sergei Avdeyev
- James Bagian
-
 Ellen Baker
- Michael Baker
- Aleksandr Balandin
- Daniel Barry
- John-David F. Bartoe
- Charlie Bassett (1931–1966) original pilot, Gemini 9.
- Yuri Baturin, first Russian politician in space.
 Patrick Baudry, first African-born man and second Frenchman in space- Alan Bean, flew on Apollo 12 and was the fourth person to walk on the Moon.
- Robert L. Behnken
 Ivan Bella, first Slovak in space.- Pavel Belyayev (1925–1970)
- Georgi Beregovoi (1921–1995)
- Anatoli Berezovoy
- Brian Binnie, second commercial astronaut.
- John Blaha
- Michael J. Bloomfield
- Guion Bluford, first African-American in space.
- Karol Bobko, first graduate of the United States Air Force Academy to become an astronaut.
- Charles Bolden
 Roberta Bondar, first Canadian woman in space.- Frank Borman, commander of Apollo 8, the first spaceflight to orbit the Moon.
- Kenneth Bowersox
- Charles Brady (1951–2006)
- Vance Brand
- Daniel Brandenstein
- Roy Bridges. Became Director of the Kennedy Space Center in March 1997
- Curtis Brown
- *David M. Brown (1956–2003)
- Mark Brown
- James Buchli
- Jay Buckey
- Nikolai Budarin
- Daniel Burbank
- Daniel Bursch
- Valery Bykovsky (born 1934)
- Robert Cabana
- Tracy Caldwell
- Charles Camarda
- Kenneth Cameron
- Duane Carey
- Scott Carpenter, a Project Mercury astronaut.
- Gerald Carr
- Sonny Carter, (1947–1991)
- John Casper
- Robert Cenker
- Gene Cernan, flew on Apollo 17
- *Roger B. Chaffee, died in the Apollo 1 disaster.
- Gregory Chamitoff
 / Franklin Chang-Diaz, first Hispanic-American in space, flew on seven space flights. / Philip K. Chapman, first Australian-born astronaut. / *Kalpana Chawla (1961–2003), first Indian-American woman in space, died in the Space Shuttle Columbia disaster. Maurizio Cheli Chen Quan, backup Shenzhou 7.- Leroy Chiao
- Kevin Chilton
- Jean-Loup Chrétien, first French person in space and first non-Soviet European to walk in space
- *Laurel B. Clark (1961–2003), died in the Space Shuttle Columbia disaster.
- Mary Cleave
- Jean-François Clervoy
- Michael Clifford
- Michael Coats
- Kenneth Cockrell
- Catherine Coleman (born 1960)
- Eileen Collins
- Michael Collins (born 1930), flew on Apollo 11 crew. Was the first Italian-born person in space. (Collins was born in Rome to American parents.)
- Pete Conrad, Apollo 12, (1930–1999), the third person to walk on the Moon and the commander of the first Skylab mission.
- Gordon Cooper (1927–2004), the first American to fly in space for a day.
- Richard Covey
- John Creighton
- Robert Crippen, Space Shuttle pioneer
- Roger Crouch
- Frank Culbertson
- Walter Cunningham, flew on Apollo 7.
- Robert Curbeam
- Nancy Currie
- Nancy Jan Davis
- Lawrence J. DeLucas
- Lev Demin (1926–1998)
 Frank De Winne- Vladimir N. Dezhurov
- *Georgi Dobrovolski (1928–1971)
- Takao Doi, first Japanese to walk in space.
- B. Alvin Drew (born 1962)
- Brian Duffy
- Charles Duke, flew on Apollo 16.
- Bonnie J. Dunbar
 Pedro Duque, first Spaniard in space.- Samuel T. Durrance
- Vladimir Dzhanibekov
- Joe Edwards
- Donn F. Eisele (1930–1987), flew on Apollo 7.
- Anthony W. England
- Joseph H. Engle
- Ronald Evans (1933–1990)
 Reinhold Ewald- Léopold Eyharts
- John Fabian
 Muhammed Faris, first Syrian in space. Bertalan Farkas, first Hungarian in space.- Jean-Jacques Favier
- Fèi Jùnlóng
- Konstantin Feoktistov
- Christopher Ferguson
- Martin Fettman
- Anatoli Filipchenko
- John L. Finley (1935–2006), trained for the Manned Orbiting Laboratory program.
- Edward Fincke
- Anna Fisher
- William Frederick Fisher
- Klaus-Dietrich Flade
- /
 Michael Foale, holds the American and British Record for time spent in space at 374 days, 11 hours, 19 minutes.
- Michael Foreman
- Patrick Forrester
- Michael Fossum
- Ted Freeman (1930–1964) NASA group 3
- Stephen Frick
- Dirk Frimout, first Belgian in space.
 Christer Fuglesang, first Swede in space.- Charles Fullerton
- Reinhard Furrer (1940–1995)
- Yuri Gagarin (1934–1968), first person in space.
- Ronald Garan
- Dale Gardner
- Guy Gardner
- Marc Garneau, first Canadian in space.
- Owen Garriott
- Charles Gemar
- Michael Gernhardt
- Edward Gibson
- Robert L. Gibson
- Yuri Gidzenko
- Ed Givens (1930–1967) NASA group 5
- Yuri Glazkov
- John Glenn (born 1921), first American to orbit the Earth, and later, the oldest person to make a spaceflight.
- Linda Godwin
- Viktor Gorbatko
- Richard Gordon, flew on Apollo 12.
- Dominic Gorie
- Ronald Grabe
- Georgi Grechko
- Frederick Gregory
- William Gregory
- Stanley Griggs (1939–1989)
- *Virgil Grissom (1926–1967), first NASA astronaut to go into space twice and the first person to go into space twice in a capsule-type spacecraft. Would have been the first person to fly three times. Died in the Apollo 1 disaster.
- John Grunsfeld
- Aleksei Gubarev
- Umberto Guidoni
 Zhugderdemidiyn Gurragcha, first Mongolian in space.- Sidney Gutierrez
- Chris Hadfield, first Canadian to walk in space.
- Claudie Haigneré, first Frenchwoman in space.
- Jean-Pierre Haigneré
- Fred Haise, flew on Apollo 13.
- James Halsell
- Kenneth Ham
- Lloyd Hammond
- Gregory Harbaugh
- Bernard Harris, first African-American to walk in space.
- Terry Hart
- Henry Hartsfield
- Frederick Hauck
- Steven Hawley
- Susan Helms
- Karl Henize (1926–1993)
- Thomas Hennen
- Terence Henricks
 Miroslaw Hermaszewski, first Pole in space.- John Herrington, first Native American in space.
- Richard Hieb
- Joan Higginbotham
- David Hilmers
- Kathryn Hire
- Charles Hobaugh
- Jeffrey Hoffman
- Scott Horowitz
- Akihiko Hoshide
- Millie Hughes-Fulford, first female Payload Specialist.
- *Rick D. Husband (1957–2003), died in the Space Shuttle Columbia disaster.
- James Irwin (1930–1991), flew on Apollo 15.
- Aleksandr Ivanchenkov
- Georgi Ivanov, first Bulgarian in space.
- Marsha Ivins
 Sigmund Jähn, first German in space- Mae Jemison, first African-American woman in space
- Tamara E. Jernigan
- Brent W. Jett, Jr.
- Gregory H. Johnson
- Thomas D. Jones
- Leonid Kadenyuk, first Ukrainian in space since independence.
- Alexander Kaleri, first Russian in space since independence.
- Janet Kavandi
- James Kelly
- Mark E. Kelly
- Scott Kelly
- Joseph Kerwin
- Yevgeny Khrunov (1933–2000)
- Leonid Kizim
- Petr Klimuk, first Belarusian in space.
- *Vladimir Komarov (1927–1967), killed during a USSR space flight.
- Yelena V. Kondakova
- Oleg Kononenko
- Valery Korzun
- Oleg Kotov
- Vladimir Kovalyonok
- Konstantin Kozeyev
- Kevin Kregel
- / Sergei Krikalev, six space flights and, as of 2006, holds record for longest total time in space: 803 days, 9 hours and 39 minutes.
- Valeri Kubasov (born 1935)
 André Kuipers
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