Publishers
- P & O 1
- P. & G. Wells Ltd. 1
- P. Binstead 1
- P.A. Norstedt & Soner 1
- P.B.S. 1
- P.F. Volland Company 2
- P.I.C. 1
- P.M. (Productions) Ltd. 6
- P.M. Evans 1
- P.M. Evans And Son 2
- P.M. Heaton Publishing 10
- P.R. Gawthorn Ltd. 7
- P4 Spares 2
- Pacific Press Publishing Association 1
- Pacifica Press 2
- Paddington Press 3
- Pagan World Press 1
- Palace Books 1
- Paladin Press 2
- Paladwr Press 4
- Palgrave 1
- Palgrave Macmillan 7
- Pall Mall Gazette 2
- Pan Books Ltd 1
- Pan Macmillan Children's Books 3
- Pangolin London 5
- Panico Press 1
- Panstwowe Muzeum Archeologiczne 1
- Panzerwrecks 1
- Papadakis 1
- Paper Tiger 1
- Paperview Uk Ltd 1
- Paragon House 1
- Pardy & Son Ltd. 1
- Parish Pump Press 3
- Parker, Furnivall & Parker 2
- Parkgate Books 2
- Parragon 15
- Parragon Books 2
- Particular Books 3
- Partizan Press 1
- Partridge 10
- Partridge Press 1
- Partridge Publications Ltd. 1
- Past & Present Publishing 3
- Past and Present Publishing Ltd. 10
- Past Times 1
- Paternoster Press 1
- Paterson Press Ltd 1
- Paterson's Publications 1
- Pathfinder 1
- Patrick Hardy Books 1
- Patrick Stephens 27
- Patrick Stephens Limited 37
- Patterson Smith 1
- Paul Elek 2
- Paul Hamlyn 2
- Paul Harris 1
- Paul Harris Publishing 2
- Paul Mellon Centre For British Art 1
- Paul Naylor 1
- Paul Parey 1
- Paul Quinn 1
- Paul R. Green, Ian P. Green And Geraldine A. Crouch 1
- Paul Watkins 3
- Pauline Page-Jones 1
- Pavilion 6
- Pavilion Books 6
- Pavilion Books Limited 2
- Pavilion Books Ltd. 8
- Pavilion Children'S Books 3
- Payne And Mackinlay 1
- Payot 1
- Peco Publications 1
- Pedigree Books Limited 62
- Peebles Press 1
- Peeters 1
- Peggy Cloth Books, Inc. 1
- Peko Publishing Kft. 2
- Pelham Books 15
- Pelham Richardson 1
- Pelican Publishing 1
- Pen & Sword 1
- Pen & Sword Aviation 17
- Pen & Sword Books 5
- Pen & Sword History 1
- Pen & Sword Maritime 3
- Pen & Sword Military 23
- Pen & Sword Transport 10
- Pen Press 1
- Pen Press Publishers Ltd. 2
- Penarth Past Oral History Group 3
- Pendragon Books 2
- Pendragon Partnership 1
- Pendragon Publishing 1
- Pendyke Publications 1
- Penguin 23
- Penguin Books 10
- Penguin Books Ltd 42
- Penguin Press 1