Harvard Law School (HLS) is the law school of Harvard University, a private research university in Cambridge, Massachusetts. Founded in 1817, Harvard Law School is the oldest continuously operating law school in the United States.

A law library is a special library used by law students, lawyers, judges and their law clerks, historians, and other scholars of legal history in order to research the law. Law libraries are also used by people who draft or advocate for new laws, e.g. legislators and others who work in state government, local government, and legislative counsel offices or the U.S. Office of Law Revision Counsel and lobbying professionals. Self-represented, or pro se, litigants also use law libraries.