Dr. Reinhold Ewald (born December 18, 1956) is a German physicist and ESA astronaut. 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 20 days in space. He performed experiments in biomedical and material sciences, and carried out operational tests in preparation for the International Space Station.