The judiciary of New Zealand is responsible for the system of courts that interprets and applies the laws of New Zealand. It has four primary functions: to provide a mechanism for dispute resolution; to deliver authoritative rulings on the meaning and application of legislation; to develop case law; and to uphold the rule of law, personal liberty and human rights. The judiciary is supported in its work by an executive department, the Ministry of Justice.

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 The Supreme Court Act 2003 was repealed on 1 March 2017 and superseded by the Senior Courts Act 2016.