Publishers
- Peninsula Press 1
- Pentagon Press 1
- Pentech Press 1
- Pentland Books Ltd 1
- Per Ardua Books 1
- Perca Press 2
- Percival Marshall & Co. 1
- Percival Marshall And Co Ltd. 7
- Percy Lund, Humphries & Co. Ltd. 2
- Pergamon Press 8
- Perpetua 1
- Perry Colour Books Ltd. 4
- Perry Miniatures 1
- Peter A. Harding 2
- Peter A. Heims Limited 1
- Peter B. Gunn 1
- Peter Davies 2
- Peter Garnett 1
- Peter Haddock 4
- Peter Hopwood & Co. Ltd 2
- Peter Huston Publishing 1
- Peter Lunn 2
- Peter Lunn (publishers) Ltd 1
- Peter Lunn Ltd. 1
- Peter Marcan Publications 3
- Peter Maskell Publishing Services 1
- Peter McBride & Richard Larn 1
- Peter Owen 2
- Peter Pitkin 3
- Peter Vine 1
- Peterson Publishing Company Limited 1
- Peveril Books 1
- Phaidon 3
- Phaidon Press 2
- Phaidon Press Limited 9
- Phalanx Publishing Co. Ltd. 1
- Pharos 1
- Philip Alan & Co Ltd 1
- Philip Allan 1
- Philip Allan & Co. 1
- Philip Wilson 2
- Philip Wilson Publishers 1
- Philippsen 2
- Philips Electrical Limited 1
- Phillimore 21
- Phillimore & Co. Ltd. 7
- Phillipson & Golder 1
- Philomel Books 3
- Phoebus 2
- Phoenix House 1
- Phoenix Illustrated 1
- Phoenix Publishing 1
- Photo Precision 1
- Photoglob Co. 1
- Photovision 1
- Physica-Verlag 1
- Piaggio 1
- Piatkus 1
- Pica Press 4
- Picador 1
- Piccadilly Press 6
- Pickering & Inglis 2
- Pickering & Inglis Ltd. 5
- Picton Publishing 4
- Pictorial Histories Publishing Company 6
- Picture Corgi 1
- Picture Lions 1
- Pilot Press Ltd. 1
- Pinter Publishers 1
- Pisces Angling Publications 1
- Pisces Publications 4
- Pitkin 8
- Pitkin Pictorials 1
- Pitman 1
- Pitman Publishing 2
- Pj Publishing Ltd 2
- Plateway Press 1
- Platform 5 2
- Platform 5 Publishing Ltd 1
- Platt & Munk 1
- Playette Corp. 1
- Playways Office 3
- Pleasure Books 1
- Pleiades Books 1
- Pleiades Books Ltd. 6
- Plenum 3
- Plus Four Books 1
- PM (Productions) Ltd. 1
- Pocket Mountains Ltd 1
- Podzun-Pallas 1
- Pole Position Communications 2
- Polus Press 1
- Polynyas Press 1
- Polytint Limited 2
- Pongo Books 1
- Pont Books 1
- Pookie Productions Ltd. 1
- Popular Dogs 3
- Popular Library 1
- Popular Prakashan 1