Hagen Rether (born 8 October 1969 in Bucharest) is a Romanian-born German political cabaret artist and musician.

Hagen Rether spent his early childhood in Bucharest and Sibiu, Romania as the son of German, Transylvanian Saxon parents of Siebenbürgen.

Throughout much of the show he alternates or accompanies his monologue with the piano modifying song selection, tempo and style according to the topic he is about to cover.

Important targets for his satires and biting ironies are, among many others, the Catholic Church, George W. Bush and the German novelist and Nobel Prize winner Günter Grass, whom he criticized for not admitting that he was a member of the Waffen-SS as a teenager.

Another target is German pop singer Herbert Grönemeyer, who he alleges for commercially exploiting his own wife's death in his songs.