| Election | Date | Reason | Winner |
| 1998 A'ana Alofi No 1 By-election | 24 July 1998 | Disqualification of Suafo'a Lautusi | Maiava Visekota Peteru (HRPP) |
| 1998 Faleata East By-election | 28 August 1998 | Appointment of Matai'a Visesio Europa to the Council of Deputies | Patau'ave Etuale (SNDP) |
| 1999 Fa’asalele’aga No 1 By-election | 21 May 1999 | Death of Tofilau Eti Alesana | Seumanu Aita Ah Wa (HRPP) |
| 2002 Faleata East By-election | 2002 | Appointment of Faumuina Anapapa to the Council of Deputies | Lepou Petelo II |
| 2002 Alataua West By-election | 30 November 2002 | Death of Alii-male-manu Sasa | Ta’atiti Alofa (SNDP) |
| 2003 Alataua West By-election | 1 August 2003 | Death of Ta’atiti Alofa | Unknown (HRPP) |
| 2004 Fa’asalele’aga No 1 By-election | 19 March 2004 | Death of Seumanu Aita Ah Wa | Tiata Sili Pulufana |
| 2004 A'ana Alofi No 1 By-election | 26 November 2004 | Death of Apule Pepe Metai | Aiono Tile Gafa (HRPP) |
| 2005 Anoama'a East By-election | 2005 | Elevation of Tui Atua Tupua Tamasese Efi to the Council of Deputies | Unknown |
| 2005 Anoama'a West By-election | March 2005 | Resignation of Tuala Tagaloa Sale Kerslake | Fonotoe Pierre Lauofo (HRPP) |
| 2006 Fa’asalele’aga No 2 By-election | 24 September 2006 | Election of Pa’u Sefo Pa’u declared invalid | Rita Pa’u Letoa (HRPP) |
| 2006 Aleipata Itupa-I-Lalo By-election | 6 October 2006 | Election of Paepae Kapeli Su’a declared invalid | Muagututi’ a Siaosi Meredith (HRPP) |
| 2006 Fa’asalele’aga No 4 By-election | 6 October 2006 | Election of Mulitalo Sealiimalietoa Siafausa Vui declared invalid | Vui Tupe Ioane (HRPP) |
| 2007 Fa’asalele’aga No 2 By-election | 2 February 2007 | Election of Rita Pa’u Letoa declared invalid | Papalii Samuelu Petaia (HRPP) |
| 2007 Faleata East By-election | 23 April 2007 | Death of Manuleleua Lalagofaatasi Falaniko Leleua | Patau'ave Etuale (HRPP) |
| 2007 Vaimauga West By-election | 6 May 2007 | Death of Sililoto Tolo Tua'ifaiva | Patu Ativalu (HRPP) |
| 2010 Vaisigano No.1 By-election | 2 May 2010 | Disqualification of Va'ai Papu Vailupe | Va'ai Papu Vailupe (TSP) |
| 2010 Faleata West By-election | 14 May 2010 | Disqualification of Lealailepule Rimoni Aiafi | Ale Vena Ale (HRPP) |
| 2010 Safata By-election | 14 May 2010 | Disqualification of Palusalue Fa’apo II | Palusalue Fa’apo II (TSP) |
| 2011 Aleipata Itupa I Luga by-election | 29 July 2011 | Disqualification of Taua Kitiona Seuala (HRPP) | Fagaaivalu Kenrick Samu (HRPP) |
| 2011 Anoamaa East by-election | 29 July 2011 | Disqualification of Alai'asa Filipo Schwartz Hunt (HRPP) | Alo Fulifuli Taveuveu (HRPP) |
| 2011 Satupaitea by-election | 29 July 2011 | Disqualification of Tavu'i Tiafau Salevao (HRPP) | Lautafi Fio Selafi Purcell (HRPP) |
| 2011 Vaisigano No.1 by-election | 29 July 2011 | Disqualification of Va'ai Papu Vailupe (TSP) | Tufuga Gafoleata Faitua (HRPP) |
| 2014 Gaga'ifomauga No.1 by-election | 15 August 2014 | Death of Tuilo'a Anitele'a Tuilo'a (HRPP) | Faimalotoa Kika Stowers (HRPP) |
| 2015 Sagaga-le-Usoga by-election | 17 April 2015 | Resignation of Muagututagata Peter Ah Him (HRPP) | Seiuli Ueligitone Seiuli (HRPP) |
| 2021 Samoan by-elections | 26 November 2021 | 7 seats declared vacant by election petitions | 5 FAST, 2 HRPP MPs elected |
| 2022 Gagaʻifomauga 2 by-election | 3 June 2022 | Death of Vaʻele Paʻiaʻaua Iona Sekuini (FAST) | Fo'isala Lilo Tu'u Ioane (FAST) |
| 2023 Vaimauga 3 by-election | 24 February 2023 | Death of Tapunuu Niko Lee Hang (HRPP) | Lautimuia Uelese Vaʻai (FAST) |
| 2023 Faleata No. 4 by-election | 15 September 2023 | Resignation of Ale Vena Ale (HRPP) | Ale Vena Ale (FAST) |
| 2023 Siʻumu by-election | 15 September 2023 | Resignation of Tuʻuʻu Anasiʻi Leota (HRPP) | Tuʻuʻu Anasiʻi Leota (FAST) |
| 2023 Vaʻa-o-Fonoti by-election | 15 September 2023 | Resignation of Mauʻu Siaosi Puʻepuʻemai (HRPP) | Mauʻu Siaosi Puʻepuʻemai (FAST) |
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