Andrew "Andy" Thomas, AO
Lahir	18 Desember 1951 (umur 73) Adelaide, Australia Selatan
Status	Pensiun
Kebangsaan	Australia/Amerika Serikat
Karier luar angkasa
Antariksawan NASA
Misi	STS-77, STS-89, Mir, STS-91, STS-102, STS-114
Lambang misi

Andrew "Andy" Sydney Withiel Thomas, AO (lahir 18 Desember 1951) adalah seorang insinyur penerbangan Amerika Serikat kelahiran Australian dan antariksawan NASA. Ia menjadi warga negara AS pada Desember 1986 dengan tujuan dapat masuk program antariksa NASA.^[1] Ia menikahi antariksawati NASA Shannon Walker.

• Colin Burgess. Australia's Astronauts: Three Men and a Spaceflight Dream, Kangaroo Press, 1999.

• NASA Astronaut Bio: Andrew S. W. Thomas (Ph.D.)(1/2008)
• Astronaut blasts lack of research into space (The Sun-Herald, 20 May 2004): Comments from Thomas about state of Australian space science
• Ri Aus - people in Science
• National Museum of Australia: A fragment of wooden propeller from the Southern Cross, flown by Charles Kingsford Smith in the 1920s and 30s, which was taken into space by Andy Thomas in 2001 to honour Kingsford Smith's aviation achievements.