Brian H. Hook (born 1968) is an American lawyer and government official. He served as U.S. Special Representative for Iran and Senior Policy Advisor to Secretary of State Mike Pompeo from September 2018 to August 2020. He previously served as the Director of Policy Planning under Secretary of State Rex Tillerson. Hook practiced corporate law at Hogan & Hartson in Washington from 1999 to 2003. He has also worked for Iowa Governor Terry Branstad and U.S. Congressman Jim Leach.