John Edward Walsh (born November 3, 1960) is an American politician and former military officer. He was a United States Senator from Montana from 2014 to 2015. He is a member of the Democratic Party. He was the 34th Lieutenant Governor of Montana from 2013 to 2014 under Governor Steve Bullock.
In October 2013, Walsh announced his candidacy for the U.S. Senate in 2014 to replace Max Baucus. In August 2014, he dropped out of the race after The New York Times reported he had plagiarized parts of a research paper he had written at the Army War College in 2007.