Vicky Jo Hartzler (née Zellmer; born October 13, 1960) is an American politician who served as the U.S. representative for Missouri's 4th congressional district from 2011 to 2023. A member of the Republican Party, she served as the Missouri state representative for the 124th district from 1995 to 2001.Hartzler's district comprised a large swath of western-central Missouri, anchored in Columbia and stretching to the eastern and southern Kansas City suburbs, including a sliver of Kansas City. The district also included Sedalia, Warrensburg, Moberly, and Lebanon. Hartzler was a candidate in the 2022 United States Senate election in Missouri, but lost the Republican primary to Eric Schmitt.