Roger Keith Crouch (born September 12, 1940) is an American scientist and astronaut who flew as a payload specialist on two NASA Space Shuttle missions in 1997.

Gregory Thomas Linteris, Ph.D. (born October 4, 1957 in Englewood, New Jersey) is an American scientist who flew as a payload specialist on two NASA Space Shuttle missions in 1997.

Jay Clark Buckey, Jr. (born June 6, 1956, in New York City) is an American physician and astronaut who flew aboard one space shuttle mission (STS-90) as a Payload Specialist.

James Anthony "Jim" Pawelczyk (born September 20, 1960) is an American researcher of physiology and Kinesiology who flew aboard the NASA STS-90 Space Shuttle mission as a Payload Specialist.

Gregory Olsen (born April 20, 1945) is an American entrepreneur, engineer and scientist who, in October 2005, became the third private citizen to make a self-funded trip to the International Space Station with the company Space Adventures.

Anousheh Ansari (born September 12, 1966) is an Iranian-American engineer. On September 18, 2006, a few days after her 40th birthday, she became the first Iranian in space. Ansari was the fourth overall self-funded space tourist, and the first self-funded woman to fly to the International Space Station.

Charles Simonyi (born September 10, 1948) is a Hungarian-born American computer businessman. In April 2007, aboard Soyuz TMA-10, he became the fifth space tourist and the second Hungarian in space. In March 2009, aboard Soyuz TMA-14, he made a second trip to the International Space Station.

Richard Allen Garriott de Cayeux (born July 4, 1961) is an English-American video game developer and entrepreneur. On October 12, 2008, Garriott flew aboard Soyuz TMA-13 to the International Space Station as a private astronaut, returning 12 days later aboard Soyuz TMA-12. He became the second astronaut, and first from the U.S., who had a parent that was also a space traveler.

Guy Laliberté. (born 2 September 1959) is a Canadian businessman, investor, poker player, and musician. In September 2009, Guy Laliberté became the first Canadian space tourist. His spaceflight was dedicated to raising awareness on water issues facing humankind on planet Earth, making his spaceflight the first, in his words, "poetic social mission" in space.

Mark Richard Shuttleworth (born 18 September 1973) is a South African entrepreneur. He launched aboard the Russian Soyuz TM-34 mission as a spaceflight participant, paying approximately US$27,000,000 for the voyage.

Dennis Anthony Tito (born August 8, 1940) is an American engineer and multimillionaire, most widely known as the first space tourist to fund his own trip into space. In mid-2001, he spent nearly eight days in orbit as a crew member of ISS EP-1, a visiting mission to the International Space Station.

Jean-Pierre Haigneré (born 19 May 1948) is a French Air Force officer and a former CNES spationaut. He flew on two missions to the Mir space station in 1993 and 1999. The Mir Altair long-duration mission (186 days) in 1993 also included an EVA.