| Office: | President of the Landtag of Liechtenstein |
| Termstart: | January 2001 |
| Termend: | February 2009 |
| Birth Date: | 24 February 1941 |
| Birth Place: | Schaan, Liechtenstein |
| Party: | Progressive Citizens' Party |
| Successor: | Arthur Brunhart |
| Predecessor: | Peter Wolff |
| Children: | 2 |
| Caption: | Wolff in 1992 |
| Vicepresident: | Ivo Klein |
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.
Wanger married Adelheid Ritter (born 26 March 1938) on 6 July 1964 and they have two children.