Publishers
- Mitchell Hughes and Clarke 6
- Mitchell Information Services Inc. 1
- Mitsubishi Motors Corporation 1
- Mixing 1
- Model & Allied Publications 1
- Model Aeronautical Press Limited 1
- Model And Allied Publications 3
- Modern Promotions 3
- Mondo 1
- Monmouthshire Antiquarian Association 1
- Monnow Press 3
- Moody Press 1
- Moonraker Press 2
- Moorland Publishing 7
- Morgan & Lester Publishers 1
- Morgan County Historical Society 1
- Morning Sun Books, Inc. 1
- Morris & Company 1
- Morris Motors Limited 2
- Morrison & Gibb Ltd. 5
- Morrow Junior Books 1
- Moss Rose Press 34
- Motivate Publishing 2
- Motor Racing Publications Ltd. 24
- Motoraces Book Club 4
- Motorbooks 2
- Motorbooks International 10
- Motorbuch Verlag 3
- Mountain House 1
- Mountain Press Publishing Company 1
- Mouton De Gruyter 1
- Mr. Edwin Stooke 1
- Mr. Norman Rose 1
- Mrp 1
- MRP Publishing Ltd 1
- Mrs. Eugenia Stanhope 1
- Mtp Press Limited 1
- Muinck & Co. 2
- Mulder & Zoon 4
- Mullet Press 1
- Mullock & Sons Limited 1
- Munksgaard 1
- Munshiram Manoharlal 1
- Murfett Pty. Ltd. 1
- Murray's Children's Books 4
- Murrays Sales & Service Co. 6
- Mursia 1
- Museet For Varde By Og Omegn 1
- Musei Vaticani 1
- Museum Of Art 3
- 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
- N. & S. Press 1
- N.J. International 2
- N.V. De Technische Uitgeverij H. Stam-Haarlem 1
- Nadas 1
- Nai Publishers 1
- Nand Kishore & Bros 1
- Narkiewicz Thompson 1
- Narrow Gauge Railway Society 1
- National Academy Of Sciences 1
- National Academy Press 2
- National Army Museum 1
- National Book Trust 1
- National Botanic Gardens 1
- National Galleries Of Scotland 2
- National Gallery 3
- National Gallery Company Limited 1
- National Gallery Of Victoria 2
- National Gallery Publications Limited 2
- National Geographic Society 5
- National Geographical Society Of India 1
- National Heritage Museum 1
- National Institute Of Environmental Health Sciences 1
- National Library Of Australia 1
- National Library Of Ireland 1
- National Maritime Museum 1
- National Museum of Wales 7
- National Museums Northern Ireland 2
- National Museums Of Scotland Publishing Limited 1
- National Portrait Gallery 4
- National Radiological Protection Board 1
- National Railway Museum 1
- National Society's Depository 3
- Nattali & Maurice Limited 1
- Natural History Publications (borneo) 4
- Nautical & Aviation Publishing Company Of America 1
- Nautical Association Of Australia Inc. 2
- Nautical Publishing Company 1
- Naval Institute Press 15
- Navigator Publishing Ltd. 1
- Nebulous Books 1
- Neil Wilson 1
- Nelson 6