Ward Nicholas Boylston (1747–1828; born Ward Hallowell), a descendant of the physician Zabdiel Boylston, was an American merchant, a philanthropist, and benefactor of Harvard University. He was a brother of Admiral Sir Benjamin Hallowell Carew, one of Nelson's Band of Brothers, and a nephew of Governor Moses Gill. He was brother in law to John Elmsley, Chief Justice of Upper and Lower Canada (via marriage to his sister Mary).