Reimar Lüst (25 March 1923 – 31 March 2020) was a German astrophysicist. He was the president of the German Max Planck Society from 1972 to 1984 and the director general of the European Space Agency (ESA) from 1984 until 1990. Lüst was a professor at New York, MIT and Caltech before he became the director general of the ESA.