Jeffrey Bossert Clark is an American lawyer who served as the acting administrator of the Office of Information and Regulatory Affairs at the Office of Management and Budget from March 2025 to March 2026. Clark served as the assistant attorney general for the Environment and Natural Resources Division from 2018 to 2021 and as the acting assistant attorney general for the Civil Division from 2020 to 2021. In 2020 and 2021, Clark allegedly helped then-president Donald Trump attempt to overturn the 2020 presidential election. Clark's actions in that endeavor were reviewed by the District of Columbia Bar – the entity authorized by law to pursue attorney discipline and disbarment in the District of Columbia – which recommended discipline to the DC Court of Appeals in July 2022, and in August 2024 its Board on Professional Responsibility recommended a two year suspension of his law license. In July 2025, the board recommended to the appeals court that Clark be disbarred. He was identified as an unindicted co-conspirator in the federal prosecution of Donald Trump over attempts to overturn the 2020 election. On August 14, 2023, he was indicted along with 18 other people in the prosecution related to the 2020 election in Georgia.