- Jack AbbottLabour (Co-op)MP for IpswichMP since 2024
- Ms Diane AbbottIndependentMP for Hackney North and Stoke NewingtonMP since 1987
- Debbie AbrahamsLabour (Co-op)MP for Oldham East and SaddleworthMP since 2011
- Shockat AdamIndependentMP for Leicester SouthMP since 2024
- Baroness Adams of CraigieleaLabour (Co-op)Member of the House of LordsPeer since 2005
- Lord AddingtonLiberal DemocratMember of the House of LordsPeer since 1986
- Lord AdebowaleCrossbenchMember of the House of LordsPeer since 2001
- Lord AdonisLabour (Co-op)Member of the House of LordsPeer since 2005
- Lord Agnew of OultonConservativeMember of the House of LordsPeer since 2017
- Lord Ahmad of WimbledonConservativeMember of the House of LordsPeer since 2011
- Dr Zubir AhmedLabour (Co-op)MP for Glasgow South WestMP since 2024
- Luke AkehurstLabour (Co-op)MP for North DurhamMP since 2024
- Sadik Al-HassanLabour (Co-op)MP for North SomersetMP since 2024
- Mr Bayo AlabaLabour (Co-op)MP for Southend East and RochfordMP since 2024
- Lord AlderdiceLiberal DemocratMember of the House of LordsPeer since 1996
- Dan AldridgeLabour (Co-op)MP for Weston-super-MareMP since 2024
- Baroness Alexander of ClevedenLabour (Co-op)Member of the House of LordsPeer since 2025
- Heidi AlexanderLabour (Co-op)MP for Swindon SouthMP since 2024
- Mr Douglas AlexanderLabour (Co-op)MP for Lothian EastMP since 2024
- Rushanara AliLabour (Co-op)MP for Bethnal Green and StepneyMP since 2010
- Tahir AliLabour (Co-op)MP for Birmingham Hall Green and MoseleyMP since 2019
- Lord Allan of HallamNon-affiliatedMember of the House of LordsPeer since 2010
- Lord Allen of KensingtonLabour (Co-op)Member of the House of LordsPeer since 2013
- Lord AlliLabour (Co-op)Member of the House of LordsPeer since 1998
- Dr Rosena Allin-KhanLabour (Co-op)MP for TootingMP since 2016
- Jim AllisterTraditional Unionist VoiceMP for North AntrimMP since 2024
- Baroness AltmannNon-affiliatedMember of the House of LordsPeer since 2015
- Lord Alton of LiverpoolCrossbenchMember of the House of LordsPeer since 1997
- Lord AltrinchamConservativeMember of the House of LordsPeer since 2026
- Baroness AmosLabour (Co-op)Member of the House of LordsPeer since 1997
- Gideon AmosLiberal DemocratMP for Taunton and WellingtonMP since 2024
- Lord Anderson of IpswichCrossbenchMember of the House of LordsPeer since 2018
Source: parliament.uk · 1,440 currently sitting · Open Government Licence v3.0