UK Parliamentarians
- Lord Mackenzie of FramwellgateNon-affiliatedMember of the House of LordsPeer since 1998
- Lord Mackinlay of RichboroughConservativeMember of the House of LordsPeer since 2024
- Baroness Maclean of RedditchConservativeMember of the House of LordsPeer since 2025
- Lord Macpherson of Earl's CourtCrossbenchMember of the House of LordsPeer since 2016
- Justin MaddersLabourMP for Ellesmere Port and BromboroughMP since 2015
- Lord Magan of CastletownConservativeMember of the House of LordsPeer since 2011
- Lord Maginnis of DrumglassIndependent Ulster UnionistMember of the House of LordsPeer since 2001
- Ben MaguireLiberal DemocratMP for North CornwallMP since 2024
- Helen MaguireLiberal DemocratMP for Epsom and EwellMP since 2024
- Shabana MahmoodLabourMP for Birmingham LadywoodMP since 2010
- Lord MairCrossbenchMember of the House of LordsPeer since 2015
- Alan MakConservativeMP for HavantMP since 2015
- Seema MalhotraLabourMP for Feltham and HestonMP since 2011
- Mr Cathal MallaghanSinn FéinMP for Mid UlsterMP since 2024
- Baroness MallalieuLabourMember of the House of LordsPeer since 1991
- Lord Malloch-BrownCrossbenchMember of the House of LordsPeer since 2007
- Kit MalthouseConservativeMP for North West HampshireMP since 2015
- Lord ManceCrossbenchMember of the House of LordsPeer since 2005
- The Lord Bishop of ManchesterBishopsMember of the House of LordsPeer since 2020
- Lord MannLabourMember of the House of LordsPeer since 2019
- Baroness Manningham-BullerCrossbenchMember of the House of LordsPeer since 2008
- Baroness ManzoorConservativeMember of the House of LordsPeer since 2013
- Lord MarkhamConservativeMember of the House of LordsPeer since 2022
- Lord Marks of HaleConservativeMember of the House of LordsPeer since 2024
- Lord Marks of Henley-on-ThamesLiberal DemocratMember of the House of LordsPeer since 2011
- Lord MarlandConservativeMember of the House of LordsPeer since 2006
- Baroness Martin of BrockleyLabourMember of the House of LordsPeer since 2026
- Amanda MartinLabourMP for Portsmouth NorthMP since 2024
- Mike MartinLiberal DemocratMP for Tunbridge WellsMP since 2024
- Rachael MaskellLabourMP for York CentralMP since 2015
- Paul MaskeySinn FéinMP for Belfast WestMP since 2011
- Lord Massey of HampsteadConservativeMember of the House of LordsPeer since 2025
Source: parliament.uk · 1,424 currently sitting · Open Government Licence v3.0