Publishers
- Moody Press 1
- Moonraker Press 1
- Moorland Publishing 7
- Morgan & Lester Publishers 1
- Morning Sun Books, Inc. 1
- Morris & Company 1
- Morris Motors Limited 3
- Morrison & Gibb Ltd. 3
- Morrow Junior Books 1
- Moss Rose Press 37
- Motivate Publishing 4
- Motor Racing Publications Ltd. 33
- Motoraces Book Club 4
- Motorbooks 3
- Motorbooks International 13
- Motorbuch 1
- Motorbuch Verlag 3
- Motta 1
- Mountain House 1
- Mouton De Gruyter 1
- Mr. Edwin Stooke 1
- Mr. Norman Rose 1
- Mrp 3
- 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. 6
- Mursia 1
- Museet For Varde By Og Omegn 1
- Musei Vaticani 1
- 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
- Mx Publishing 2
- My Garden 2
- Myers & Rogers 1