The use of cannabis in New Zealand is regulated by the Misuse of Drugs Act 1975, which makes unauthorised possession of any amount of cannabis a crime. Cannabis is the fourth-most widely used recreational drug in New Zealand, after caffeine, alcohol and tobacco, and the most widely used illicit drug. In 2001 a household survey revealed that 13.4% of New Zealanders aged 15–64 used cannabis. This ranked as the ninth-highest cannabis consumption level in the world.

The 2020 New Zealand cannabis referendum was a non-binding referendum held on 17 October 2020 in conjunction with the 2020 general election and a euthanasia referendum, on the question of whether to legalise the sale, use, possession and production of recreational cannabis. It was rejected by New Zealand voters. The form of the referendum was a vote for or against the proposed "Cannabis Legalisation and Control Bill". Official results were released by the Electoral Commission on 6 November 2020 with 50.7% of voters opposing the legalisation and 48.4% in support.