The Supreme Court of New Jersey is the highest court in the U.S. state of New Jersey. In its current form, the Supreme Court of New Jersey is the final judicial authority on all cases in the state court system, including cases challenging the validity of state laws under the state constitution. It has the sole authority to prescribe and amend court rules and regulate the practice of law, and it is the arbiter and overseer of the decennial legislative redistricting. One of its former members, William J. Brennan Jr., became an associate justice of the Supreme Court of the United States.

The Constitution of the State of New Jersey is the basic governing document of the State of New Jersey. In addition to three British Royal Charters issued for East Jersey, West Jersey and united New Jersey while they were still colonies, the state has been governed by three constitutions. The first was adopted on July 2, 1776, shortly before New Jersey ratified the United States Declaration of Independence and the second came into effect in 1844. The current document was adopted in 1947 and has been amended several times.