| Birth Date: | 3 November 1866 |
| Birth Place: | Schellenberg, Liechtenstein |
| Death Date: | 21 February 1935 (aged 68) |
| Death Place: | Schellenberg, Liechtenstein |
| Spouse: | |
| Children: | 12 |
| Party: | Progressive Citizens' Party |
| Office: | Member of the Landtag of Liechtenstein for Unterland |
| Term Start: | 1918 |
| Term End: | 1932 |
| Office2: | Mayor of Schellenberg |
| Termstart2: | 1915 |
| Termend2: | 1927 |
| Predecessor2: | Andreas Hassler |
| Successor2: | Adolf Goop |
Karl Kaiser (3 November 1866 – 21 February 1935) was a politician from Liechtenstein who served in the Landtag of Liechtenstein. He also served as mayor of Schellenberg from 1915 to 1927.
Kaiser was born on 3 November 1866 as the son of the mayor Josef Kaiser and Elisabeth Elkuch. He worked as a farmer. He was the commander Schellenberg fire brigade 1892 to 1906. From 1903 to 1915 he was a member of the Schellenberg municipal council and then deputy mayor of the municipality from 1909 to 1915, when he succeeded Andreas Hassler as mayor after his death in March 1915. He remained mayor until 1927.[1]
Kaiser was a founding member of the Progressive Citizens' Party in 1918. He was a member of the Landtag of Liechtenstein from 1918 to 1932, where he was also a member of the finance commission and state committee.[2] In addition, he was a deputy judge at the Liechtenstein supreme court from 1922 to 1927.
Kaiser married Rosa Goop (27 October 1872 – 6 July 1907) on 7 January 1895 and they had six children together. He then went on to marry Angelina Hasler (3 September 1878 – 2 June 1922) on 24 May 1909 and they had another six children together.
He died on 21 February 1935 in Schellenberg, aged 68 years old.[3]