Katherine Emeline Langley 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.

John Wesley Langley was a U.S. Representative from Kentucky, husband of Katherine Gudger Langley.