Karl Diller (born 27 January 1941) is a German politician.

Born in Kaiserslautern, Rhineland-Palatinate, he represents the SPD.

Karl Diller has served as a member of the Bundestag from the state of Rhineland-Palatinate from 1987 until 2009.

From 1998 to 2009 he was Parliamentary State Secretary to the Federal Minister of Finance.

This biography article about a member of the Social Democratic Party of Germany (SPD) is a stub.