Michael R. Cooney (born September 3, 1954) is an American politician who served as the 36th lieutenant governor of Montana from 2016 to 2021. He previously served in the Montana House of Representatives (1977–1981), as the secretary of state of Montana (1989–2001), in the Montana Senate (2003–2011), as the president of the Montana Senate (2007–2009) and ran unsuccessfully for Governor of Montana in 2000. Cooney was the Democratic nominee for governor of Montana in the 2020 election, losing to Republican U.S. Representative Greg Gianforte.