Klaus Wanger (born 24 February 1941) is a former politician from Liechtenstein who served as the President of the Landtag of Liechtenstein from 2001 to 2009.

[1] Wagner was Vice President of the Progressive Citizens' Party from 1982 to 1986.

[2] He represented the Schaan electoral district and is a member of the Progressive Citizens' Party.

He was a member of the Landtag of Liechtenstein from 1993 to 2009, having previously pursued a business career.

[2] Wanger married Adelheid Ritter (born 26 March 1938) on 6 July 1964 and they have two children.