The Supreme Court of New Zealand is the highest court and the court of last resort of New Zealand. It formally came into being on 1 January 2004 and sat for the first time on 1 July 2004. It replaced the right of appeal to the Judicial Committee of the Privy Council, based in London. It was created with the passing of the Supreme Court Act 2003, on 15 October 2003. At the time, the creation of the Supreme Court and the abolition of appeals to the Privy Council were controversial constitutional changes in New Zealand. The Supreme Court Act 2003 was repealed on 1 March 2017 and superseded by the Senior Courts Act 2016.

In most legal jurisdictions, a supreme court, also known as a court of last resort, apex court, and high court of appeal, is the highest court within the hierarchy of courts. Broadly speaking, the decisions of a supreme court are binding on all other courts in a nation and are not subject to further review by any other court. Supreme courts typically function primarily as appellate courts, hearing appeals from decisions of lower trial courts, or from intermediate-level appellate courts. A Supreme Court can also, in certain circumstances, act as a court of original jurisdiction, however, this is typically limited to constitutional law.