Sir Alasdair Workman MacRobert, Baronet

Sir George MacPherson-Grant, Baronet

Earl of Malmesbury

Sir Edward Malet, Baronet

Duke of Marlborough

Earl of Mar and Kellie

Earl of Mexborough

Baron Massy

Sir Robert Mond, LLD, MA, FSA

Marquess of Milford Haven

Major Samuel and Lady Sophia Montgomerie
(Earl of Eglinton and Winton)

Sir Edmund Monson, Baronet

Rt Hon Henry George Hill Mulholland
(Baron Dunleath)

Sir Alexander Kay Muir, Baronet

A.E.F. Murray, Esq
(Duke of Atholl)