Glenn William "GT" Thompson Jr. 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.

Pennsylvania's 15th congressional district has been located in western and central Pennsylvania since 2019. Since 2023, the district includes all of Armstrong, Cameron, Centre, Clarion, Clearfield, Clinton, Elk, Forest, Jefferson, McKean, Potter, Snyder, Tioga, Union, and Warren counties and parts of Indiana, Lycoming, and Venango counties.