Publishers
- Panico Press 1
- Panstwowe Muzeum Archeologiczne 1
- Panther Publishing 1
- Panzerwrecks 1
- Papadakis 1
- Paper Tiger 2
- Paperview Uk Ltd 1
- Paragon House 1
- Parasol Unit 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 13
- Partridge Press 1
- Partridge Publications Ltd. 1
- Passmore Edwards Museum Trust 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 2
- Patrick Stephens 32
- Patrick Stephens Limited 39
- Patterson Smith 1
- Paul Elek 2
- Paul Hamlyn 4
- Paul Harris 1
- Paul Harris Publishing 3
- Paul Mellon Centre for British Art 1
- Paul Parey 1
- Paul Quinn 1
- Paul Watkins 2
- Pauline Page-Jones 1
- Pavilion 7
- 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
- Pelham Books 17
- 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 12
- Pen Press 1
- Pen Press Publishers Ltd. 2
- Penarth Past Oral History Group 4
- Pendragon Books 2
- Pendragon Partnership 3
- Pendragon Publishing 1
- Pendyke Publications 6
- Penguin 29
- Penguin Books 13
- Penguin Books Ltd 48
- Peninsula Press 1
- Pentagon Press 1
- Pentech Press 1
- Pentland Books Ltd 1
- Pentrex 1
- Per Ardua Books 1
- Perca Press 2
- Percival & Co. 1
- Percival Marshall & Co. 1
- Percival Marshall And Co 1
- Percival Marshall And Co Ltd. 7
- Percy Lund, Humphries & Co. Ltd. 2
- Pergamon Press 8
- Pernice Press 1
- Perpetua 1
- Perry Colour Books Ltd. 3
- Perry Miniatures 1
- Peter A. Harding 2
- Peter A. Heims Limited 1
- Peter B. Gunn 1
- Peter Crawley 1
- Peter Davies 2
- Peter Garnett 1