Thomas Arthur Reiter (born May 23, 1958 in Frankfurt, Germany) is a retired European astronaut and is a Brigadier General in the Luftwaffe currently working as Director of Human Spaceflight and Operations at the European Space Agency (ESA). As of 2008, he was one of the top 25 astronauts in terms of total time in space. With his wife and two sons he lives in Wahnbek (near Oldenburg) in Lower Saxony.
In 1982, Reiter received his diploma in aerospace engineering from the Bundeswehr University Munich. In 2010 the university awarded him an honorary doctoral degree. He completed his training as a pilot in Germany and Texas.
He served as an onboard engineer for the Euromir 95/Soyuz TM-22 mission to the Mir space station. During his 179 days aboard Mir, he carried out two EVAs and became the first German astronaut to perform a spacewalk.