Michael Owen "Mike" Johanns (born June 18, 1950) is an American Republican politician who has been the junior United States Senator from Nebraska since 2009. Previously he was Governor of Nebraska from 1999 to 2005 and was U.S. Secretary of Agriculture from 2005 to 2007. On November 4, 2008, Johanns was elected to the United States Senate for the state of Nebraska, becoming one of only two new Republican senators (with Jim Risch of Idaho) heading into the 111th United States Congress.

Johanns was born in Osage, Iowa, and grew up living and working on his family's farm. After graduating from high school, Johanns went on to study at Saint Mary's University of Minnesota in Winona. He earned a law degree from Creighton University. After his graduation, Johanns began practicing law in O'Neill and Lincoln, Nebraska.

Johanns served on the Lancaster County Board from 1983 to 1987 as a Democrat. In 1988 he switched party alliances and was elected to the Lincoln City Council where he served from 1989 to 1991. He was elected as Mayor of Lincoln in 1991 and 1995. He then ran successfully for Governor of Nebraska in 1998.