A
- Charles McLaren, 1st Baron Aberconway
- Charles McLaren, 3rd Baron Aberconway
- Charles McLaren, 4th Baron Aberconway
- Henry McLaren, 2nd Baron Aberconway
- George Abercromby, 2nd Baron Abercromby
- George Abercromby, 3rd Baron Abercromby
- George Abercromby, 4th Baron Abercromby
- John Abercromby, 5th Baron Abercromby
- Mary Abercromby, 1st Baroness Abercromby
- Alastair Bruce, 5th Baron Aberdare
- Clarence Bruce, 3rd Baron Aberdare
- Henry Bruce, 1st Baron Aberdare
- Henry Bruce, 2nd Baron Aberdare
- Morys Bruce, 4th Baron Aberdare
- Hugh Scarlett, 7th Baron Abinger
- James Scarlett, 1st Baron Abinger
- James Scarlett, 4th Baron Abinger
- James Scarlett, 8th Baron Abinger
- James Scarlett, 9th Baron Abinger
- Robert Scarlett, 2nd Baron Abinger
- Robert Scarlett, 6th Baron Abinger
- Shelley Scarlett, 5th Baron Abinger
- William Scarlett, 3rd Baron Abinger
- Archibald Acheson, 3rd Earl of Gosford
- John Dalberg-Acton, 1st Baron Acton
- John Lyon-Dalberg-Acton, 3rd Baron Acton
- Richard Lyon-Dalberg-Acton, 2nd Baron Acton
- Richard Lyon-Dalberg-Acton, 4th Baron Acton
- John Adams, 1st Baron Adams
- Dominic Hubbard, 6th Baron Addington
- Egerton Hubbard, 2nd Baron Addington
- James Hubbard, 5th Baron Addington
- John Hubbard, 1st Baron Addington
- John Hubbard, 3rd Baron Addington
- Raymond Hubbard, 4th Baron Addington
- Edgar Adrian, 1st Baron Adrian
- Richard Adrian, 2nd Baron Adrian
- Ailwyn Fellowes, 1st Baron Ailwyn
- Carol Fellowes, 4th Baron Ailwyn
- Eric Fellowes, 3rd Baron Ailwyn
- Oliver Kitson, 4th Baron Airedale
- Roland Kitson, 3rd Baron Airdale
- Albert Kitson, 2nd Baron Airdale
- Richard Airey, 1st Baron Airey
- Sir Max Aitken, 2nd Baronet
- Beauchamp Seymour, 1st Baron Alcester
- William de Aldeburgh, 1st Baron Aldeburgh
- William de Aldeburgh, 2nd Baron Aldeburgh
- Alban Gibbs, 2nd Baron Aldenham
- Anthony Gibbs, 5th Baron Aldenham
- Hucks Gibbs, 1st Baron Aldenham
- Vicary Gibbs, 6th Baron Aldenham
- Walter Gibbs, 4th Baron Aldenham
- Charles Low, 2nd Baron Aldington
- Toby Low, 1st Baron Aldington
- Henry Sturt, 1st Baron Alington
- Humphrey Sturt, 2nd Baron Alington
- Napier Sturt, 3rd Baron Alington
- Clifford Allen, 1st Baron Allen of Hurtwood
- Wentworth Beaumont, 1st Baron Allendale
- William Jackson, 1st Baron Allerton
- Robert Munro, 1st Baron Alness
- Edward Grigg, 1st Baron Altrincham
- Richard Arden, 1st Baron Alvanley
- William Arden, 2nd Baron Alvanley
- Robert Yerburgh, 1st Baron Alvingham
- Charles Dundas, 1st Baron Amesbury
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A cont.
- William Tyssen-Amherst, 1st Baron Amherst of Hackney
- Charles Ammon, 1st Baron Ammon
- Oliver Russell, 2nd Baron Ampthill
- Geoffrey Russell, 4th Baron Ampthill
- Odo Russell, 1st Baron Ampthill
- Basil Mackenzie, 2nd Baron Amulree
- William Mackenzie, 1st Baron Amulree
- Frederick Montague, 1st Baron Amwell
- Henry White, 1st Baron Annaly
- Luke White, 2nd Baron Annaly
- Luke White, 5th Baron Annaly
- Luke White, 6th Baron Annaly
- Arthur Annesley, 11th Viscount Valentia
- Tonman Mosley, 1st Baron Anslow
- George Archibald, 1st Baron Archibald
- Charles Perceval, 2nd Baron Arden
- Arthur Guinness, 1st Baron Ardilaun
- John Lonsdale, 1st Baron Armaghdale
- William Armstrong, 1st Baron Armstrong
- Sydney Arnold, 1st Baron Arnold
- Edward Gibson, 1st Baron Ashbourne
- William Gibson, 2nd Baron Ashbourne
- Alexander Baring, 1st Baron Ashburton
- Alexander Baring, 6th Baron Ashburton
- Bingham Baring, 2nd Baron Ashburton
- Francis Denzil Edward Baring, 5th Baron Ashburton
- John Baring, 7th Baron Ashburton
- George Cubitt, 1st Baron Ashcombe
- Henry Cubitt, 2nd Baron Ashcombe
- Henry Cubitt, 4th Baron Ashcombe
- Roland Cubitt, 3rd Baron Ashcombe
- Albert Stanley, 1st Baron Ashfield
- Thomas Ashton, 2nd Baron Ashton of Hyde
- Thomas Ashton, 3rd Baron Ashton of Hyde
- Thomas Ashton, 1st Baron Ashton of Hyde
- James Williamson, 1st Baron Ashton
- John Jacob Astor, 1st Baron Astor of Hever
- Gavin Astor, 2nd Baron Astor of Hever
- John Astor, 3rd Baron Astor of Hever
- William Waldorf Astor, 1st Viscount Astor
- George Murray, 6th Duke of Atholl
- John Stewart-Murray, 7th Duke of Atholl
- John Stewart-Murray, 8th Duke of Atholl
- Robert Eden, 3rd Baron Auckland
- Herbert Austin, 1st Baron Austin
- John Lubbock, 3rd Baron Avebury
- Eric Lubbock, 4th Baron Avebury
- John Lubbock, 1st Baron Avebury
- John Lubbock, 2nd Baron Avebury
- Gilbert Heathcote, 1st Baron Aveland
B
- Peter Baden-Powell, 2nd Baron Baden-Powell
- Robert Baden-Powell, 3rd Baron Baden-Powell
- Robert Baden-Powell, 1st Baron Baden-Powell
- Clive Baillieu, 1st Baron Baillieu
- Harold Balfour, 1st Baron Balfour of Inchrye
- James Carnegie, 9th Earl of Southesk
- Frederick Banbury, 1st Baron Banbury of Southam
- Charles Middleton, 1st Baron Barham
- Diana Noel, 2nd Baroness Barham
- Alexander Baring, 4th Baron Ashburton
- Francis Baring, 3rd Baron Ashburton
- Vernon Willey, 2nd Baron Barnby
- Francis Willey, 1st Baron Barnby
- Peter Bennett, 1st Baron Bennett of Edgbaston
- Baron Freiherr von Bush of Coburg-Gotha
- John Pakington, 1st Baron Hampton
- Wilfrid Ashley, 1st Baron Mount Temple
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B cont.
- James Sinclair, 14th Earl of Caithness
- Arthur Smith-Barry, 1st Baron Barrymore
- George Sclater-Booth, 1st Baron Basing
- Neil Sclater-Booth, 5th Baron Basing
- Michael Bass, 1st Baron Burton
- William Bateman-Hanbury, 2nd Baron Bateman
- Cyril Flower, 1st Baron Battersea
- Robert Sanders, 1st Baron Bayford
- Maxwell Aitken, 3rd Baron Beaverbrook
- Max Aitken, 1st Baron Beaverbrook
- Edward Strutt, 1st Baron Belper
- Henry Strutt, 2nd Baron Belper
- John Ganzoni, 2nd Baron Belstead
- Lord Charles Beresford
- John Bethell, 1st Baron Bethell
- Nicholas Bethell, 4th Baron Bethell
- William Beveridge
- Nicholas Vansittart, 1st Baron Bexley
- Randal Smith, 2nd Baron Bicester
- Vivian Smith, 1st Baron Bicester
- Michael Biddulph, 1st Baron Biddulph
- George Lane-Fox, 1st Baron Bingley
- Christopher Birdwood, 2nd Baron Birdwood
- William Birdwood, 1st Baron Birdwood
- Michael Birkett, 2nd Baron Birkett
- Norman Birkett, 1st Baron Birkett
- Glyn Mason, 2nd Baron Blackford
- John Bloomfield, 2nd Baron Bloomfield
- James Blyth, 1st Baron Blyth
- Archibald Campbell, 1st Baron Blythswood
- Archibald Douglas, 4th Baron Blythswood
- Robert Borwick, 1st Baron Borwick
- John Bourchier (died 1495)
- Claude Bowes-Lyon, 13th Earl of Strathmore and Kinghorne
- John Boyd Orr, 1st Baron Boyd-Orr
- Ivon Moore-Brabazon, 3rd Baron Brabazon of Tara
- Derek Moore-Brabazon, 2nd Baron Brabazon of Tara
- John Moore-Brabazon, 1st Baron Brabazon of Tara
- Edward Knatchbull-Hugessen, 1st Baron Brabourne
- Edward Knatchbull-Hugessen, 2nd Baron Brabourne
- John Knatchbull, 7th Baron Brabourne
- Michael Knatchbull, 5th Baron Brabourne
- Norton Knatchbull, 6th Baron Brabourne
- Norton Knatchbull, 8th Baron Brabourne
- Wyndham Knatchbull-Hugessen, 3rd Baron Brabourne
- John Bradbury, 1st Baron Bradbury
- John Bradbury, 3rd Baron Bradbury
- Russell Brain, 1st Baron Brain
- Valentine Crittall, 1st Baron Braintree
- Henry Hawkins, 1st Baron Brampton
- George Wilshere, 1st Baron Bramwell
- Henry Brassey, 1st Baron Brassey of Apethorpe
- Baron Braybrooke
- David Lewis, 1st Baron Brecon
- Edward Bridges, 1st Baron Bridges
- Thomas Bridges, 2nd Baron Bridges
- George Broadbridge, 1st Baron Broadbridge
- Charles Nall-Cain, 1st Baron Brocket
- Charles Nall-Cain, 3rd Baron Brocket
- Ronald Nall-Cain, 2nd Baron Brocket
- Henry Brougham, 1st Baron Brougham and Vaux
- Michael Brougham, 5th Baron Brougham and Vaux
- Victor Brougham, 4th Baron Brougham and Vaux
- William Davison, 1st Baron Broughshane
- John Hobhouse, 1st Baron Broughton
- Geoffrey Browne, 3rd Baron Oranmore and Browne
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