UK Parliamentarians
- Lord Duncan of SpringbankConservativeMember of the House of LordsPeer since 2017
- Mr Peter DuncanConservativeMP for Galloway and Upper NithsdaleMP since 2001
- Sir Alan DuncanConservativeMP for Rutland and MeltonMP since 1992
- Neil Duncan-JordanLabourMP for PooleMP since 2024
- Lord Duncan-SandysConservativeMember of the House of LordsPeer since 1974
- The Earl of DundeeConservativeMember of the House of LordsPeer since 1983
- Earl of DundonaldConservativeMember of the House of LordsPeer since 1986
- Lord DunleathCrossbenchMember of the House of LordsPeer since 1997
- Lord DunleathNon-affiliatedMember of the House of LordsPeer since 1993
- John DunlopUnited Ulster Unionist PartyMP for Mid UlsterMP since 1974
- Lord DunlopConservativeMember of the House of LordsPeer since 2015
- Earl of DunmoreCrossbenchMember of the House of LordsPeer since 1995
- Earl of DunmoreCrossbenchMember of the House of LordsPeer since 1981
- Earl of DunmoreLiberalMember of the House of LordsPeer since 1980
- Baroness DunnCrossbenchMember of the House of LordsPeer since 1990
- James DunnSocial Democratic PartyMP for Liverpool, KirkdaleMP since 1964
- Mr Bob DunnConservativeMP for DartfordMP since 1979
- Jimmy DunnachieLabourMP for Glasgow, PollokMP since 1987
- Philip DunneConservativeMP for LudlowMP since 2005
- Jack DunnettLabourMP for Nottingham EastMP since 1964
- Viscount DunrossilCrossbenchMember of the House of LordsPeer since 1961
- Mrs Gwyneth DunwoodyLabourMP for Crewe and NantwichMP since 1974
- Sir Anthony DurantConservativeMP for Reading WestMP since 1974
- The Lord Bishop of DurhamBishopsMember of the House of LordsPeer since 1994
- The Lord Bishop of DurhamBishopsMember of the House of LordsPeer since 2003
- The Lord Bishop of DurhamBishopsMember of the House of LordsPeer since 1984
- The Lord Bishop of DurhamBishopsMember of the House of LordsPeer since 2014
- Mark DurkanSocial Democratic & Labour PartyMP for FoyleMP since 2005
- Lord DuvallLabourMember of the House of LordsPeer since 2026
- Sarah DykeLiberal DemocratMP for Glastonbury and SomertonMP since 2023
- Lord DykesCrossbenchMember of the House of LordsPeer since 2004
- Lord DynevorNon-affiliatedMember of the House of LordsPeer since 1962
Source: parliament.uk · 1,424 currently sitting · Open Government Licence v3.0