David Wayne Loebsack (; born December 23, 1952) is an American politician who served as the U.S. representative for Iowa's 2nd congressional district from 2007 to 2021. A member of the Democratic Party, he also is an emeritus professor of political science at Cornell College, where he had taught since 1982. On April 12, 2019, Loebsack announced he would not seek reelection.