Ann Louise Wagner (née Trousdale, September 13, 1962) is an American politician and diplomat serving as the U.S. Representative for Missouri’s 2nd congressional district since 2013. A member of the Republican Party, she previously was the United States Ambassador to Luxembourg from 2005 to 2009.
Her district, based in St. Louis County, is heavily suburban and the wealthiest district in the state. It includes most of St. Louis’s southern and western suburbs as well as some of the northern exurbs in St. Charles County and the northern portion of Jefferson County. Prior to her diplomatic post, Wagner chaired the Missouri Republican Party for six years, from 1999 until 2005; she co-chaired the Republican National Committee for four years, starting in 2001.