| Dan Theno | |
| State: | Wisconsin |
| State Senate: | Wisconsin |
| District: | 25th |
| Term Start: | 1972 |
| Term End: | 1987 |
| Preceded: | Arthur Cirilli |
| Succeeded: | Robert Jauch |
| Party: | Republican |
| Birth Date: | 8 May 1947 |
| Birth Place: | Ashland, Wisconsin |
| Alma Mater: | University of Wisconsin–Madison |
Daniel O. Theno (born May 8, 1947) was an American politician and educator.
Born in Ashland, Wisconsin, Theno graduated with a BS from the University of Wisconsin - Madison in 1969. He spent his senior year teaching at the University of Rio Grade do Sol in Porto Alegre, Brazil, under a university fellowship. He taught agriculture. Theno won a special election to the Wisconsin State Senate in 1972 from the 25th District of northern Wisconsin, defeating Ernest J. Korpela. He was re-elected in 1974, 1978, and 1982.[1] In April 1986, Theno was elected mayor of Ashland, Wisconsin.[2]