Reinhard Alfred Furrer (25 November 1940 – 9 September 1995) was a German physicist and astronaut.

Furrer wore the Sinn (watchmaker) model 140 S on his wrist during the STS-61-A mission in 1985 After his spaceflight he became a professor in 1987 as well as the Director of the Institute of Space Sciences at the Free University of Berlin.

He was a passenger of pilot Gerd Kahdemann in a historic Bf 108 when the plane crashed shortly after 6:00 p.m. after performing a roll at low altitude.

From the files of the GDR State Security Service:[citation needed] Concerning FURRER it is known that, as a member of the Arbeitsgemeinschaft 13 August e.V.

Besides his usual code name "Kurt Jacob" he was also known under the aliases "Reinhard", "Jens", "Heino", "Nikolai" and "Bartmann"... A permanent exhibition, dedicated to Furrer was opened in the Checkpoint Charlie Museum.