Mike Vehle (born November 17, 1949) is an American politician and a Republican member of the South Dakota Senate representing District 20 since January 2009.
Vehle served consecutively in the South Dakota Legislature from January 2005 until January 2009 in the South Dakota House of Representatives District 20 seat.
He was a lifelong Democrat until deciding to run for office, when he switched his voter registration to Republican.
Having been a lifelong Democrat is considered the rationale for his liberal voting record while serving in the state legislature.