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. 7
- P.M. Evans 1
- P.M. Evans And Son 2
- P.M. Heaton Publishing 11
- 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 3
- Paladwr Press 5
- Palgrave 1
- Palgrave Macmillan 7
- Pall Mall Gazette 2
- Pan Books 1
- Pan Books Ltd 1
- Pan Macmillan Children's Books 1
- Pangolin London 5
- Panico Alpinverlag 1
- Panico Press 1
- Panstwowe Muzeum Archeologiczne 1
- Panther Publishing 1
- Panzerwrecks 1
- Papadakis 1
- Paper Tiger 2
- Paperview Uk Ltd 1
- Paragon House 1
- Pardy & Son Ltd. 1
- Parents' Magazine Press 1
- Parish Pump Press 3
- Parker, Furnivall & Parker 2
- Parkgate Books 1
- Parley Books 2
- Parragon 16
- Parragon Books 3
- Particular Books 3
- Partizan Press 2
- Partridge 12
- Partridge Press 1
- Partridge Publications Ltd. 1
- Past & Present Publishing 2
- Past and Present Publishing Ltd. 13
- Past Times 1
- Paternoster Press 1
- Paterson Press Ltd 1
- Paterson's Publications 1
- Patrick Hardy Books 1
- Patrick Stephens 32
- Patrick Stephens Limited 39
- Patterson Smith 1
- Paul Elek 3
- Paul Hamlyn 4
- Paul Harris 1
- Paul Harris Publishing 3
- Paul Mellon Centre for British Art 1
- Paul Parey 1
- Paul Quinn 1
- Paul R. Green, Ian P. Green And Geraldine A. Crouch 1
- Paul Watkins 2
- Pauline Page-Jones 1
- Pavilion 8
- Pavilion Books 6
- Pavilion Books Limited 2
- Pavilion Books Ltd. 10
- Pavilion Children'S Books 2
- Pawpaw Press 1
- Payne And Mackinlay 1
- Payot 1
- Peco Publications 2
- Peco Publications And Publicity Ltd. 1
- Pedigree Books Limited 65
- Peebles Press 1
- Peeters 1
- Peggy Cloth Books, Inc. 1
- Peko Publishing Kft. 2
- Pelagic Publishing 1
- Pelham Books 18
- Pelham Richardson 1
- Pelican Publishing 1
- Pen & Sword 1
- Pen & Sword Air World 1
- Pen & Sword Aviation 13
- Pen & Sword Books 5
- Pen & Sword Maritime 1
- Pen & Sword Military 26
- Pen & Sword Transport 14
- Pen Press 1
- Pen Press Publishers Ltd. 2
- Penarth Past Oral History Group 4
- Pendragon Books 2
- Pendragon Partnership 3