Reinhold Ewald (born December 18, 1956) is a German physicist and astronaut.
Born in Mönchengladbach, Germany, he received diploma in experimental physics from the University of Cologne in 1983 and the PhD in 1986, with a minor degree in human physiology.
In 1990 he was selected to the German astronaut team, training for the Mir'92 mission. He was the backup of Klaus-Dietrich Flade for the Soyuz TM-14 mission. In 1995 he began training for the second German Mir mission. In February 1997 he flew to the space station Mir with Soyuz TM-25, spending 18 days in space. He performed experiments in biomedical and material sciences, and carried out operational tests in preparation for the International Space Station.
In February 1999 he joined ESA's European Astronaut Corps at the European Astronaut Centre (EAC) in Cologne, Germany.
He is married and has three children. He enjoys reading and spending time with his family, and performs with an amateur theatre group. His main sports are soccer and holds a black belt in karate.