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.'Wisconsin Blue Book 1985-1986,' Biographical Sketch of Daniel Theno, pg. 70 In April 1986, Theno was elected mayor of Ashland, Wisconsin.'Voters decide mayoral race across Wisconsin,' Eau Claire Leader-Telegram, April 2, 1986, pg. 14A

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