Publishers
- 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 2
- Palgrave Macmillan 9
- Pall Mall Gazette 2
- Pan Books Ltd 1
- Pan Macmillan Children's Books 3
- Pangolin London 5
- Panico Press 1
- Panstwowe Muzeum Archeologiczne 1
- Papadakis 1
- Paper Tiger 1
- Papermac 2
- Paperview Uk Ltd 1
- Paragon House 1
- Pardy & Son Ltd. 1
- Parish Pump Press 3
- Parker, Furnivall & Parker 2
- Parkgate Books 1
- Parley Books 2
- Parragon 15
- Parragon Books 2
- Parthian 1
- Particular Books 2
- Partizan Press 1
- Partridge 10
- Partridge Press 1
- Partridge Publications Ltd. 1
- Past & Present Publishing 2
- Past and Present Publishing Ltd. 9
- Past Times 1
- Pat Lyne 1
- Paternoster Press 1
- Paterson Press Ltd 1
- Paterson's Publications 1
- Pathfinder 1
- Patrick Stephens 23
- Patrick Stephens Limited 36
- Patterson Smith 1
- Paul Elek 2
- Paul Hamlyn 2
- Paul Harris 1
- Paul Harris Publishing 2
- Paul Ingham 1
- 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 2
- 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 60
- Peebles Press 1
- Peko Publishing Kft. 2
- Pelham Books 17
- Pelham Books Ltd. 1
- Pelham Richardson 1
- Pelican Publishing 1
- Pen & Sword 1
- Pen & Sword Aviation 15
- Pen & Sword Books 5
- Pen & Sword History 1
- Pen & Sword Maritime 2
- Pen & Sword Military 22
- Pen & Sword Transport 7
- 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 19
- Penguin Books 9
- Penguin Books Ltd 31
- Penguin Press 1
- 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. 6