# List of longest-serving members of the New Zealand Parliament

This is a list of members of the New Zealand Parliament who have served for at least 30 years. The time of service is not always continuous and separate terms are aggregated.
A total of 35 individuals have served in excess of 30 years in Parliament.

## Members of Parliament who have served for at least 30 years

Key
| Liberal | Reform | Labour |
| National | NZ First | United Future |
†: Died in office
| Name | First elected | Left Parliament | Highest office held | Period of service |
| Rex Mason | 15 April 1926 | 25 October 1966 | Cabinet Minister | 40 years, 193 days |
| Sir Keith Holyoake | 1 December 1932 | 10 March 1977 | Prime Minister | 39 years, 94 days |
| Sir Maurice O'Rorke | 18 January 1861 | 5 November 1902 | Speaker of the House | 38 years, 235 days |
| Sir Walter Nash | 18 December 1929 | 4 June 1968† | Prime Minister | 38 years, 169 days |
| Jonathan Hunt | 26 November 1966 | 30 March 2005 | Speaker of the House | 38 years, 124 days |
| Sir Āpirana Ngata | 20 December 1905 | 30 August 1943 | Cabinet Minister | 37 years, 253 days |
| Sir Joseph Ward | 26 September 1887 | 8 July 1930† | Prime Minister | 36 years, 306 days |
| Winston Peters | 24 May 1979 | present | Deputy Prime Minister | 36 years, 304 days |
| Trevor Mallard | 14 July 1984 | 20 October 2022 | Speaker of the House | 35 years, 87 days |
| Sir William Steward | 3 February 1871 | 20 November 1911 | Speaker of the House | 34 years, 287 days |
| George Forbes | 17 November 1908 | 30 August 1943 | Prime Minister | 34 years, 286 days |
| Sir Eruera Tirikatene | 3 August 1932 | 11 January 1967† | Cabinet Minister | 34 years, 161 days |
| Warren Freer | 24 September 1947 | 29 October 1981 | Cabinet Minister | 34 years, 35 days |
| Clyde Carr | 14 November 1928 | 31 May 1962 | Chairman of Committees | 33 years, 198 days |
| Peter Dunne | 14 July 1984 | 23 September 2017 | Cabinet Minister | 33 years, 71 days |
| William Hughes Field | 6 January 1900 | 1 November 1935 | MP | 32 years, 278 days |
| Sir Arnold Nordmeyer | 27 November 1935 | 28 October 1969 | Leader of the Opposition | 32 years, 230 days |
| Sir James Carroll | 7 September 1887 | 27 November 1919 | Cabinet Minister | 32 years, 81 days |
| Peter Fraser | 3 October 1918 | 12 December 1950† | Prime Minister | 32 years, 70 days |
| Phil Goff | 28 November 1981 | 12 October 2016 | Leader of the Opposition | 31 years, 309 days |
| Robert McKeen | 7 December 1922 | 5 October 1954 | Speaker of the House | 31 years, 302 days |
| Bill Parry | 17 December 1919 | 27 July 1951 | Cabinet Minister | 31 years, 222 days |
| Gordon Coates | 19 December 1911 | 27 May 1943† | Prime Minister | 31 years, 159 days |
| Sir Robert Muldoon | 26 November 1960 | 17 December 1991 | Prime Minister | 31 years, 35 days |
| William Massey | 9 April 1894 | 10 May 1925† | Prime Minister | 31 years, 31 days |
| Sir James Allen | 26 September 1887 | 22 March 1920 | Cabinet Minister | 30 years, 330 days |
| Damien O'Connor | 6 November 1993 | present | Cabinet Minister | 30 years, 245 days |
| Nick Smith | 27 October 1990 | 10 June 2021 | Cabinet Minister | 30 years, 226 days |
| Bob Tizard | 30 November 1957 | 27 October 1990 | Deputy Prime Minister | 30 years, 196 days |
| Sir Robert Macfarlane | 3 June 1939 | 28 October 1969 | Speaker of the House | 30 years, 147 days |
| Sir Thomas Wilford | 4 December 1896 | 18 November 1929 | Leader of the Opposition | 30 years, 109 days |
| Annette King | 14 July 1984 | 23 September 2017 | Cabinet Minister | 30 years, 63 days |
| Murray McCully | 15 August 1987 | 23 September 2017 | Cabinet Minister | 30 years, 39 days |
| Maurice Williamson | 15 August 1987 | 23 September 2017 | Cabinet Minister | 30 years, 39 days |
| Thomas Young Duncan | 9 December 1881 | 19 December 1911 | Cabinet Minister | 30 years, 10 days |
Table footnotes:
* ↑ date of dissolution of the 34th Parliament
* ↑ date of dissolution of the 14th Parliament
* ↑ date of dissolution of the 26th Parliament
* ↑ date of dissolution of the 17th Parliament
* ↑ date of dissolution of the 26th Parliament
* ↑ date of dissolution of the 39th Parliament
* ↑ date of dissolution of the 19th Parliament
* ↑ date of dissolution of the 30th Parliament
* ↑ date of dissolution of the 29th Parliament
* ↑ date of dissolution of the 35th Parliament