Publishers
- Morrow Junior Books 1
- Moss Rose Press 31
- Motivate Publishing 3
- Motor Racing Publications Ltd. 33
- Motoraces Book Club 4
- Motorbooks 4
- Motorbooks International 14
- Motorbuch 1
- Motorbuch Verlag 3
- Motta 1
- Mountain House 1
- Mouton De Gruyter 1
- Mr. Edwin Stooke 1
- Mr. Norman Rose 1
- Mrp 4
- Mrs. Eugenia Stanhope 1
- Mtp Press Limited 1
- Muinck & Co. 2
- Mulder & Zoon 5
- Mullet Press 1
- Mullock & Sons Limited 1
- Munksgaard 1
- Munshiram Manoharlal 1
- Murfett Pty. Ltd. 1
- Murray's Children's Books 5
- Murrays Sales & Service Co. 7
- Mursia 1
- Museet For Varde By Og Omegn 1
- Musei Vaticani 2
- Museum Of Art 2
- Museum Of London And The Council For British Archaeology 1
- Museum Of London Archaeology 1
- Museum Of Modern Art Oxford 1
- Museum Press Limited 3
- Museum Publishing Co. 1
- Mushroom Model Publications 1
- Muzeum Czestochowskie 1
- Mx Publishing 2
- My Garden 3
- Myers & Rogers 1