Markwayne Mullin (born July 26, 1977) is an American businessman and politician who has served as the junior United States senator from Oklahoma since 2023. A member of the Republican Party, he was elected in a special election in 2022 to serve the remainder of Jim Inhofe's term. Mullin is the first Native American U.S. senator since Ben Nighthorse Campbell retired in 2005. He is also the second Cherokee Nation citizen elected to the Senate; the first, Robert Latham Owen, retired in 1925. Before being elected to the Senate, Mullin served as the U.S. representative for Oklahoma's 2nd congressional district from 2013 to 2023.