| Dan Thiessen | |
| State Senate1: | Kansas |
| District1: | 15th |
| Term Start1: | 1981 |
| Term End1: | 1992 |
| Predecessor1: | John Vermillion |
| Successor1: | Tim Emert |
| State House2: | Kansas |
| District2: | 8th |
| Term Start2: | 1969 |
| Term End2: | 1980 |
| Birth Date: | 1922 10, mf=yes |
| Residence: | Independence, Kansas[1] |
| Party: | Republican |
Dan Thiessen (October 19, 1922 - November 17, 2012) was an American politician who served in the Kansas House of Representatives and Kansas State Senate.
Thiessen worked as a farmer and rancher in Independence, Kansas. He was elected to the Kansas House in 1968 and served six terms there; in 1980, he was elected to the Kansas Senate and served an additional three terms. In 1982, Thiessen was the Republican nominee for Lieutenant Governor of Kansas, but the ticket was defeated and Thiessen remained in the Senate.