Steven P. Thayn (born January 30, 1954, in Richland, Washington) is an American Republican politician who is the Idaho State Senator representing District 8. Previously, he served in the Idaho State House of Representatives, from 2007 to 2012.
Thayn graduated from Emmett High School, attended Treasure Valley Community College, and earned his teacher's certification and bachelor's degree in political science from Boise State University.