| 1 Jan, 2023 (Sun) | New Year's Day | National holiday |
| 2 Jan, 2023 (Mon) | Day after New Year's Day | National holiday |
| 3 Jan, 2023 (Tue) | Day off for New Year's Day | National holiday |
| 23 Jan, 2023 (Mon) | Wellington Anniversary Day | Local holiday |
| 30 Jan, 2023 (Mon) | Northland Anniversary Day | Local holiday |
| 30 Jan, 2023 (Mon) | Auckland Anniversary Day | Local holiday |
| 30 Jan, 2023 (Mon) | Nelson Anniversary Day | Local holiday |
| 6 Feb, 2023 (Mon) | Waitangi Day | National holiday |
| 14 Feb, 2023 (Tue) | Valentine's Day | Observance |
| 13 Mar, 2023 (Mon) | Taranaki Anniversary Day | Local holiday |
| 20 Mar, 2023 (Mon) | Otago Anniversary Day | Local holiday |
| 21 Mar, 2023 (Tue) | March Equinox | Season |
| 1 Apr, 2023 (Sat) | April Fools | Observance |
| 7 Apr, 2023 (Fri) | Good Friday | National holiday |
| 8 Apr, 2023 (Sat) | Holy Saturday | Observance |
| 9 Apr, 2023 (Sun) | Easter Sunday | Observance |
| 10 Apr, 2023 (Mon) | Easter Monday | National holiday |
| 11 Apr, 2023 (Tue) | Southland Anniversary Day | Local holiday |
| 25 Apr, 2023 (Tue) | ANZAC Day | National holiday |
| 6 May, 2023 (Sat) | The Coronation of King Charles III | Observance |
| 14 May, 2023 (Sun) | Mother's Day | Observance |
| 5 Jun, 2023 (Mon) | King's Birthday | National holiday |
| 22 Jun, 2023 (Thu) | June Solstice | Season |
| 14 Jul, 2023 (Fri) | Matariki | National holiday |
| 3 Sep, 2023 (Sun) | Fathers' Day | Observance |
| 24 Sep, 2023 (Sun) | September Equinox | Season |
| 25 Sep, 2023 (Mon) | South Canterbury Anniversary Day | Local holiday |
| 20 Oct, 2023 (Fri) | Hawke's Bay Anniversary Day | Local holiday |
| 23 Oct, 2023 (Mon) | Labour Day | National holiday |
| 30 Oct, 2023 (Mon) | Marlborough Anniversary Day | Local holiday |
| 31 Oct, 2023 (Tue) | Halloween | Observance |
| 5 Nov, 2023 (Sun) | Guy Fawkes Night | Observance |
| 17 Nov, 2023 (Fri) | Canterbury Anniversary Day | Local holiday |
| 27 Nov, 2023 (Mon) | Chatham Islands Anniversary Day | Local holiday |
| 4 Dec, 2023 (Mon) | Westland Anniversary Day | Local holiday |
| 22 Dec, 2023 (Fri) | December Solstice | Season |
| 24 Dec, 2023 (Sun) | Christmas Eve | Observance |
| 25 Dec, 2023 (Mon) | Christmas Day | National holiday |
| 26 Dec, 2023 (Tue) | Boxing Day | National holiday |
| 31 Dec, 2023 (Sun) | New Year's Eve | Observance |
