Publishers
- 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
- Popular Press Ltd. 1
- Porsche Cars 1
- Porter Press International Ltd 2
- Portico D'Abitot Press 1
- Potomac Books, Inc. 2
- Potteries Omnibus Preservation Society 1
- Prancing Tortoise Publications 1
- Prc Publishing 1
- Pre-Construct Archaeology Limited 1
- Preface 2
- Prentice Hall International 1
- Prentice-Hall 4
- Prentice-Hall Inc. 2
- Presidio Press 2
- Press Syndicate Of The University Of Cambridge 6
- Prestel 5
- Prestel Verlag 1
- Price, Stern, Sloan 1
- Princeton Architectural Press 2
- Princeton University Press 19
- Prindle, Weber & Schmidt 2
- Printed For The Society By W. Bulmer And Co. 1
- Prion Books 1
- Priory Press Limited 1
- Professional Engineering Publishing 1
- Profile Books 4
- Profile Publications 11
- Progress Publishers 1
- Promak Ltd. 1
- Promotional Reprint Company 1
- Promotional Reprint Company Ltd. 2
- Propylaen 1
- Protea Book House 1
- Providence Press 1
- Pruett Publishing Company 1
- Pryor Publications 1
- Ps Publishing 1
- Psi 1
- Pt Freeport Indonesia 1
- Publi-Inter 1
- Publications Division, Ministry Of Information And Broadcasting 1
- Publications Willy Fischer 1
- Publicity Products Limited 3
- Publicity Products Ltd. 1
- Puffin 6
- Puffin Books 39
- Pumpkin Press 1
- Punch 1
- Purnell 39
- Purnell & Sons 2
- Purnell & Sons, Ltd. 7
- Purnell Book Services Limited 2
- Purnell Books 6
- Putnam 38
- Putnam & Co. Ltd. 3
- Putnam Aeronautical Books 8
- Puzzle Books Ltd. 1
- PWS Publishers 1
- Pwyllgor Mileniwm Truddyn Millennium Committee 1