Jack Landman Goldsmith (born September 26, 1962) is a Harvard Law School professor who has written extensively in the field of international law, civil procedure, cyber law, and national security law. He has been "widely considered one of the brightest stars in the conservative legal firmament."

He was a law professor at the University of Chicago when in 2002, he joined the Bush administration as legal adviser to the General Counsel of the Department of Defense. In October 2003 he was appointed as an United States Assistant Attorney General, leading the Office of Legal Counsel in the Department of Justice under Attorney General John Ashcroft and Deputy Attorney General James Comey. He resigned in July 2004. He wrote a book about his experiences there called The Terror Presidency (2007).

Goldsmith graduated from Washington & Lee University with a Bachelor of Arts summa cum laude in 1984. He earned a second B.A. with first class honours, from Oxford University, in 1986, a J.D. from Yale Law School, in 1989, an M.A. from Oxford (which is not a separate degree, but an upgrading of the BA), in 1991, and a diploma from the Hague Academy of International Law in 1992. He clerked for Judge J. Harvie Wilkinson III on the United States Court of Appeals for the Fourth Circuit from 1989 to 1990, and for Justice Anthony Kennedy of the Supreme Court of the United States from 1990 to 1991.

He was a professor at the University of Virginia Law School before going to the University of Chicago Law School. He was working there in 2002 when he first joined the administration of President George W. Bush as a political appointee.

In 2007, Goldsmith published The Terror Presidency, a memoir about his work in the Bush administration and his thoughts on the legal opinions which were promulgated by the Department of Justice in the war on terror. His discussion covers the definition of torture, the applicability of the Geneva Conventions to the war on terror and the Iraq War, the detention and trials of suspected terrorists at Guantanamo Bay and elsewhere, and wiretapping laws. He is largely sympathetic to the concerns of the Bush administration's terrorism policies. He believed that fear of another attack drove the administration to its focus on the hard power of prerogative, rather than the soft power of persuasion. In the end, he believed the fear and concentration on hard power were counterproductive, both in the war on terror and in the extension of effective executive authority.