Although Members of Parliament in the Netherlands are elected on a party list, they can defect from their parliamentary group and create or join another.

This excludes elected parliamentary groups merging, such as GroenLinks and Labour Party merging into GroenLinks-PvdA.

House of Representatives + List of defections in the House of Representatives MP Parliamentary group Period Associated party Former New Begin date End date KVP Aarden 27 February 1968 9 May 1971 PPR AOV Nijpels 6 September 1995 18 May 1998 S2000 LPF Nawijn 17 August 2006 12 September 2006 PVV Van Bemmel 6 July 2012 19 September 2012 PVV Bontes 29 October 2013 14 April 2014 Bontes/Van Klaveren 25 April 2014 22 March 2017 VNL BP Harmsen 27 June 1968 9 May 1971 BR CPN Gortzak 14 April 1958 19 March 1959 SWP PVV Brinkman 20 March 2012 19 September 2012 OBP/DPK PVV Markuszower 20 January 2026 DNA CDA Scholten/Dijkman 8 December 1983 17 April 1985 PPR 18 April 1985 2 June 1986 SDAP Duijs 29 November 1935 8 June 1937 NVP LPF De Jong 3 October 2002 29 January 2003 Cons. LPF Eerdmans/Van Schijndel 25 September 2006 28 November 2006 One NL FvD Van Haga 13 May 2021 4 September 2023 BVNL Ephraim 5 September 2023 5 December 2023 JA21 BBB 1 September 2023 5 December 2023 PvdA Goedhart 14 May 1970 9 May 1971DS'70 CPN Gortzak 14 April 1958 19 March 1959 SWP AB Van Groenendael 1 October 1919 23 June 1922 NVP Volt Gündoğan 26 February 2022 8 March 2022 22 March 2022 5 December 2023 50+ Den Haan 6 May 2021 5 December 2023 GOUD VVD Van Haga 24 September 2019 30 November 2020 FvD 1 December 2020 30 March 2021 FvD Van Haga 13 May 2021 5 December 2023 BVNL BP Harmsen 27 June 1968 9 May 1971 BR BP Harmsen 27 June 1968 9 May 1971 BR PVV BBB 1 September 2023 5 December 2023 AOV Hendriks 11 October 1994 18 May 1998 PVV Kortenoeven/Hernandez 3 July 2012 18 September 2012 PVV Markuszower 20 January 2026 DNA VVD Houwers 25 March 2015 22 March 2017 PVV Markuszower 20 January 2026 DNA CHU Huijsen 30 March 1976 7 June 1977 KVP Aarden 27 February 1968 9 May 1971 PPR CP Janmaat 1 November 1984 2 June 1986 CD NMP De Jong 13 September 1971 6 December 1972 DMP LPF De Jong 3 October 2002 29 January 2003 Cons. NSC BBB 15 August 2025 11 November 2025 BBB Keijzer 23 February 2026 KVP Aarden 26 March 1968 9 May 1971 PPR PVV Bontes/Van Klaveren 21 March 2014 22 March 2017 VNL 50+ Klein 3 June 2014 22 March 2017 PvdD Van Kooten-Arissen 16 July 2019 5 May 2020 Krol/Van Kooten 6 May 2020 7 August 2020 Van Kooten-Arissen 8 August 2020 30 March 2021 Splinter PVV Kortenoeven/Hernandez 3 July 2012 18 September 2012 50+ Krol 3 May 2020 5 May 2020 PvdT Krol/Van Kooten 6 May 2020 7 August 2020 Krol 8 August 2020 30 March 2021 Henk Krol List BP Harmsen 27 June 1968 11 November 1968 BR Kronenburg 12 November 1968 8 May 1971 Democrats 2000 PvdA Kuzu/Öztürk 14 November 2014 22 March 2017Denk PVV Markuszower 20 January 2026 DNA SP Lazrak 3 February 2004 28 November 2006 CPN Gortzak 14 April 1958 19 March 1959 SWP PVV Markuszower 20 January 2026 DNA PVV Markuszower 20 January 2026 DNA PvdA Monasch 8 November 2016 22 March 2017 Nieuwe Wegen LPF Nawijn 23 June 2005 28 November 2006 PvN AOV Nijpels 6 September 1995 18 May 1998 S2000 D66 Nooteboom 22 June 1976 9 June 1977 DAC PvdA Ockels 21 September 1993 16 May 1994 DNP PvdA Kuzu/Öztürk 14 November 2014 22 March 2017Denk CDA Omtzigt 15 September 2021 5 December 2023 NSC LPF Van Oudenallen 7 July 2006 28 November 2006 JA21 BBB 1 September 2023 5 December 2023 VVD Van Schijndel 6 September 2006 23 September 2006 Eerdmans/Van Schijndel 25 September 2006 28 November 2006 One NL PVV Markuszower 20 January 2026 DNA CDA Scholten/Dijkman 8 December 1983 18 April 1985 Scholten 19 April 1985 2 June 1986 PvdA Goedhart 14 May 1970 9 May 1971DS'70 FvD Van Haga 13 May 2021 5 December 2023 BVNL PSP Van der Spek 21 January 1986 2 June 1986 PSO PvdA Goedhart 18 July 1970 9 May 1971DS'70 AOV Verkerk/Van Wingerden 30 May 1995 29 August 1995 Verkerk 31 March 1998 18 May 1998 VVD Verdonk 13 September 2007 16 June 2009 TON BP Verlaan 17 March 1971 9 May 1971 Van Velzen List PVV Van Vliet 21 March 2014 22 March 2017 BP Voogd 14 December 1966 21 February 1967 Voogd List RPF Wagenaar 23 April 1985 2 June 1986 AR'85 CPN Gortzak 14 April 1958 19 March 1959 SWP LPF Wijnschenk 14 November 2002 29 January 2003 VVD Wilders 3 September 2004 28 November 2006 PVV AOV Verkerk/Van Wingerden 30 May 1995 29 August 1995

Senate + List of defections in the Senate MP Parliamentary group Period Associated party Former New Begin date End date FvD Otten 15 December 2020 14 February 2021 GO AOV Batenburg 7 April 1998 7 June 1999 FvD Van Pareren 30 November 2020 14 February 2021 JA21 Nanninga 15 February 2021 12 June 2023 FvD Van Pareren 30 November 2020 14 February 2021 JA21 Nanninga 15 February 2021 12 June 2023 JA21 Beukering 18 November 2025 BBB D66 2 June 2025 VVD Duthler 26 April 2019 10 June 2019 FvD Frentrop 31 March 2022 12 June 2023 BBB Van Gasteren 31 March 2026 BBB D66 28 November 2025 AOV Hendriks 12 September 1995 15 June 1998 CDA 16 June 1998 7 June 1999 FvD Van Pareren 30 November 2020 14 February 2021 JA21 Nanninga 15 February 2021 12 June 2023 FvD Frentrop 31 March 2022 12 June 2023 BBB Kemperman 19 May 2025 8 September 2025 FvD 9 September 2025 OSF De Lange 18 May 2015 8 June 2015 FvD Van Pareren 14 December 2020 14 February 2021 JA21 Nanninga 15 February 2021 12 June 2023 BP Maris 15 February 1978 15 September 1980 FvD Nanninga 15 February 2021 12 June 2023 JA21 FvD Otten 29 July 2019 12 June 2023 GO FvD Van Pareren 30 November 2020 14 February 2021 JA21 Nanninga 15 February 2021 12 June 2023 FvD Otten 19 August 2019 8 February 2020 GO VVD Van de Sanden 8 October 2025 PvdD Visseren-Hamakers10 November 2025 FvD Otten 19 August 2019 12 June 2023 GO BBB Walenkamp 23 September 2025 FvD Van Pareren 8 December 2020 14 February 2021 JA21 Nanninga 15 February 2021 12 June 2023 SP Yildirim 25 September 2007 6 June 2011

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