Horace Gray was an American jurist who served on the Massachusetts Supreme Judicial Court, and then on the United States Supreme Court, where he frequently interpreted the Constitution in ways that increased the powers of Congress. Noted for possessing a sharp mind and an enthusiasm for legal research, he was also a staunch supporter of the authority of precedent throughout his career.

The Massachusetts Supreme Judicial Court (SJC) is the highest court in the Commonwealth of Massachusetts. Although the claim is disputed by the Supreme Court of Pennsylvania, the SJC claims the distinction of being the oldest continuously functioning appellate court in the Americas, with a recognized history dating to the establishment of the Massachusetts Superior Court of Judicature in 1692 under the charter of the Province of Massachusetts Bay.