Ryan Anthony Costello (born September 7, 1976) is an American politician, lobbyist and attorney who served as the U.S. representative for Pennsylvania's 6th congressional district from 2015 to 2019. A member of the Republican Party, he was first elected to the Congress in the 2014 midterms. Costello previously served on the Chester County Board of Commissioners (2011–2015), which he chaired from 2013 to 2015. Costello chose not to seek reelection in the 2018 election, and was succeeded by Democrat Chrissy Houlahan. After leaving Congress, Costello became a registered lobbyist.