Stephan Weidner (born 29 May 1963 in Alsfeld, Hesse), often called "Der W," is a musician and music producer. From 25 November 1980 until 18 June 2005 he was the bassist, songwriter and leader of the German hard-rock band Böhse Onkelz. Weidner was also a singer with Nordend Antistars, a collaboration with Sub7even singer Daniel Wirtz. In April 2008 Weidner's first solo album Schneller, Höher, Weidner was released.