Opinion polling for the next New Zealand general election

Various organisations have commissioned opinion polls for the next New Zealand general election to be conducted during the term of the 52nd New Zealand Parliament (2017-present). Three main polling organisations regularly sample the electorate's opinions: MediaWorks New Zealand (Newshub Reid Research), Roy Morgan Research, and Television New Zealand (1 News Colmar Brunton). The sample size, margin of error and confidence interval of each poll varies by organisation and date. The current Parliament was elected on Saturday, 23 September 2017. The next general election will take place no later than Saturday, 21 November 2020.

Poll results are listed in the table below in reverse chronological order. The highest percentage figure in each polling survey is displayed in bold, and the background shaded in the leading party's colour. The 'party lead' column shows the percentage-point difference between the two parties with the highest figures. In the instance of a tie, both figures are shaded and displayed in bold. Percentages may not add to 100 percent due to rounding. Refusals are generally excluded from the party vote percentages, while question wording and the treatment of "don't know" responses and those not intending to vote may vary between survey organisations.

Some opinion pollsters ask voters who they would prefer as Prime Minister. The phrasing of questions and the treatment of refusals, as well as "don't know" answers, differ from poll to poll.

The use of mixed-member proportional representation allows ready conversion of a party's support into a party vote percentage and therefore a number of seats in Parliament. Projections generally assume no changes to electorate seats each party holds (ACT retains Epsom, Labour retains Waiariki, etc.) unless there is a specific reason to assume change. For example, after Peter Dunne announced his retirement, projections stopped assuming United Future would retain Ōhāriu. Other parties that do not pass the 5% threshold are assumed to not to win an electorate and therefore gain no seats.

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