Glenn William "GT" Thompson Jr. (born July 27, 1959) is an American politician serving as the U.S. representative for Pennsylvania's 15th congressional district since 2019. A member of the Republican Party, he was first elected to Congress in 2008 for the state's 5th congressional district; Thompson was redistricted to the 15th congressional district in the 2018 election by an order of the Supreme Court of Pennsylvania. Since 2023, he has chaired the House Agriculture Committee.