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.

The 2020 New Zealand general election was held on Saturday 17 October 2020 to determine the composition of the 53rd New Zealand Parliament. Voters elected 120 members to the House of Representatives, 72 from single-member electorates and 48 from closed party lists. Two referendums, one on the personal use of cannabis and one on euthanasia, were also held on the same day. Official results of the election and referendums were released on 6 November.