The chief justice of New Zealand is the head of the New Zealand judiciary, and presides over the Supreme Court of New Zealand. The chief justice of New Zealand is also the chief justice of Tokelau. Before the establishment of the Supreme Court in 2004, the chief justice was the presiding judge in the High Court of New Zealand, and was also ex officio a member of the Court of Appeal of New Zealand. The office is established by the Senior Courts Act 2016, which describes the chief justice as "senior to all other judges".

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.