Michael Thomas McCaul, Sr. (b. January 14, 1962, Dallas, Texas) is an American lawyer and politician who currently is the Republican U.S. Representative for Texas's 10th congressional district. The district stretches from Austin to Houston.

McCaul grew up in suburban Dallas to a fourth generation Texan family. He graduated from Jesuit College Preparatory School of Dallas. He earned a Bachelor of Arts in history from San Antonio's Trinity University in 1984 and his Juris Doctor from St. Mary's University in 1987. McCaul also attended Harvard University, taking courses in the Kennedy School of Government.

McCaul worked as an attorney and a federal prosecutor before entering politics. He was the Chief of Counterterrorism and National Security for Texas's branch of the US Attorney's office also worked under the Department of Justice's Public Integrity Section. McCaul was appointed Deputy Attorney General in 1998 and served in this capacity until 2002. He ran for the U.S. House of Representatives in 2004. He won a crowded Republican primary in the newly created 10th District. The district was thought to be so heavily Republican that no Democrat even filed, effectively handing the seat to McCaul.