Cynthia Marie Lummis Wiederspahn (born September 10, 1954) is an American politician. Lummis is the junior United States Senator from Wyoming since 2021. She was the U.S. Representative for from 2009 to 2017.
Lummis is a member of the Republican Party. She was a State Representative (1979–1983, 1985–1993), State Senator (1993–1995), and State Treasurer (1999–2007).
She retired from Congress in 2016. She successfully ran for the United States Senate in the 2020 election, winning the election.