John Edward Walsh (born November 3, 1960) is an American politician and former military officer who served as a United States Senator from Montana from 2014 to 2015. A member of the Democratic Party, he previously served as a colonel in the Army National Guard, the adjutant general of the Montana National Guard with a state commission as a brigadier general from 2008 to 2012 and the 34th Lieutenant Governor of Montana from 2013 to 2014 under Governor Steve Bullock.