Katherine Emeline Langley (née Gudger; February 14, 1888 – August 15, 1948) was an American politician. Langley was a member of United States House of Representatives from Kentucky during the Seventieth and Seventy-first sessions of Congress. She was the wife of Kentucky politician John W. Langley and daughter of James M. Gudger, Jr., a four-term Congressman from North Carolina. She was the first woman elected to Congress from Kentucky.