Restoring the Lost Constitution: The Presumption of Liberty is a 2003 book about the United States Constitution written by Randy Barnett, a professor of law at the Georgetown University Law Center. In the book, Barnett outlines his theory of constitutional legitimacy, interpretation, and construction. He argues that the Constitution should be interpreted by its "original meaning", distinct from the Founding Fathers' original intent.

Randy Evan Barnett is an American legal scholar. He serves as the Patrick Hotung Professor of Constitutional Law at Georgetown University, where he teaches constitutional law and contracts, and is the director of the Georgetown Center for the Constitution.