Gerhard Roßbach (28 February 1893 – 30 August 1967), also spelled Rossbach, was a German Freikorps leader and nationalist political activist during the interwar period.

Born in Kehrberg, Pomerania, he gained prominence for his involvement in various right-wing paramilitary groups following World War I.

He is generally credited with inventing the brown uniforms of the Nazi Party after supplying surplus tropical khaki shirts to early troops of the Sturmabteilung (SA).

In order to be uniformly equipped for this trip the remaining stock of the East African Lettow shirts, last used by the officers of the Schutztruppe, were bought and then distributed to the cyclists.

[9] Historian Robert G. L. Waite described Roßbach as a "sadistic murderer of the so-called Fehmgericht and the notorious homosexual who, according to his own testimony, perverted Ernst Röhm".