Election | Date | Reason | Winner |
1963 European by-election | | | | Dick Rapley |
1963 Mauke by-election | | | | Julian Dashwood |
1963 Rarotonga by-election | | Teupoko'ina Morgan moved to New Zealand | | David Marama Hosking |
1965 Te-Ao-O-Tonga by-election | 9 July 1965 | Resignation of Marguerite Story | | Albert Henry (CIP) |
1966 Mauke by-election | | Resignation of Julian Dashwood | | Tupui Henry (CIP) |
1977 Takitumu by-election | 22 December 1977 | Death of Tiakana Numanga | | Iaveta Short (DP) |
1978 Mitiaro by-election | 5 October 1978 | Annulment of the general election result | | Tiki Tetava |
1991 Murienua by-election | | | | Tom Marsters (CIP) |
1994 Ivirua by-election | December 1994 | | | Jim Marurai (DAP) |
1996 Nikao–Panama by-election | July 1996 | | | Ngamau Munokoa (DP) |
1999 Pukapuka-Nassau by-election | 29 September 1999 | Invalidation of election results | | None |
2000 Pukapuka-Nassau by-election | 28 September 2000 | Invalidation of 1999 Pukapuka-Nassau by-election. | | Tiaki Wuatai (NAP) |
2002 Penrhyn by-election | 27 June 2002 | Disqualification of Tepure Tapaitau | | Wilkie Rasmussen (CIP) |
2003 Rua’au by-election | 14 August 2003 | Death of Maria Heather | | Geoffrey Heather (DP) |
2003 Arutanga by-election | 20 November 2003 | Resignation of Teina Bishop | | Teina Bishop (Independent) |
2005 Manihiki by-election | 8 February 2005 | Resignation of Robert Woonton | | Henry Puna (CIP) |
2006 Teenui-Mapumai by-election | 8 June 2006 | Retirement of Upoko Simpson | | Norman George (Independent) |
2006 Matavera by-election | 19 July 2006 | Conviction of Vaevae Pare for fraud | | Kiriau Turepu (CIP) |
2006 Akaoa by-election | 29 November 2006 | Previous election produced tied result | | Teariki Heather (CIP) |
2007 Titikaveka by-election | 7 February 2007 | Election of Robert Wigmore declared invalid | | Robert Wigmore (DP) |
2009 Tamarua by-election | 3 February 2009 | Death of Mii Parima | | Pukeiti Pukeiti (CIP) |
2011 Pukapuka by-election | 7 June 2011 | Election of Tekii Lazaro declared invalid | | Tekii Lazaro (CIP) |
2012 Titikaveka by-election | 21 June 2012 | Death of Robert Wigmore | | Selina Napa (DP) |
2013 Tamarua by-election | 29 January 2013 | Death of Pukeiti Pukeiti | | Tetangi Matapo (DP) |
2013 Murienua by-election | 19 September 2013 | Resignation of Tom Marsters | | Kaota Tuariki (CIP) |
2014 Murienua by-election | 19 February 2014 | Resignation of Kaota Tuariki | | James Beer (DP) |
2014 Mitiaro by-election | 11 November 2014 | Draw in the 2014 general election | | Results not counted due to court order. |
2015 Vaipae-Tautu by-election | 31 March 2015 | 2014 election result voided | | Moana Ioane (CIP) |
2016 Arutanga-Reureu-Nikaupara by-election | 13 October 2016 | Teina Bishop convicted of corruption | | Pumati Israela (OCI) |
2017 Avatiu–Ruatonga–Palmerston by-election | 17 May 2017 | Resignation of Albert Nicholas | | Albert Nicholas (CIP) |
2017 Ivirua by-election | 17 August 2017 | Resignation of Jim Marurai | | Tony Armstrong |
2019 Ivirua by-election | 21 January 2019 | Death of Tony Armstrong | | Agnes Armstrong |
March 2019 Tengatangi-Areora-Ngatiarua by-election | 18 March 2019 | Defection of Te-Hani Brown from the Democratic Party | | Te-Hani Brown |
November 2019 Tengatangi-Areora-Ngatiarua by-election | 14 November 2019 | Resignation of Te-Hani Brown | | Te-Hani Brown |
2021 Manihiki by-election | 5 May 2021 | Resignation of Henry Puna | | Akaiti Puna (CIP) |
2024 Penrhyn by-election | 12 March 2024 | Conviction of Robert Tapaitau for fraud | | Sarakura Tapaitau |