Publishers
- P & D Riley 1
- P. & G. Wells Ltd. 1
- P. A. Loxley-Walton 1
- P. Binstead 1
- P. Noordhoff Ltd. 1
- P.A. Norstedt & Soner 1
- P.B.S. 2
- P.C. Manaktala And Sons Private Ltd 1
- P.F. Volland Company 2
- P.I.C. 1
- P.M. (Productions) Ltd. 4
- P.M. Evans 1
- P.M. Evans And Son 2
- P.M. Heaton Publishing 4
- P.R. Gawthorn Ltd. 6
- P.S. King & Son 1
- P4 Spares 4
- Pacific Air Forces 1
- Pacifica Press 2
- Paddington Press 3
- Paddington Press Ltd. 1
- Pagan Press 1
- Pagan World Press 1
- Page One Publishing 1
- Palace Books 1
- Palaquin Publishing Ltd 1
- Palgrave Macmillan 1
- Pall Mall Gazette 3
- Pallas Athene 1
- Palores Publications 1
- Pan 2
- Pan Books 3
- Pan Macmillan Children's Books 2
- Pangolin London 5
- Panico Alpinverlag 1
- Panico Press 1
- Panstwowe Muzeum Archeologiczne 1
- Pantheon Books 3
- Paolini International, Llc 1
- Papadakis 1
- Paper Tiger 1
- Paragon House 1
- Paramount Publishing Enterprise 1
- Pardy & Son Ltd. 1
- Parents' Magazine Press 1
- Parish Of Tongwynlais 1
- Parish Pump Press 1
- Park Supplies Co. Ltd. 1
- Parker, Furnivall & Parker 5
- Parragon 21
- Parragon Book Service Ltd. 1
- Parragon Books 4
- Parry & Co. 1
- Partridge 14
- Partridge Press 1
- Partridge Publications Ltd. 1
- Past & Present Publishing 1
- Past and Present Publishing Ltd. 4
- Past Times 1
- Paternoster Press 2
- Paterson Press Ltd 1
- Paterson's Publications 1
- Patrick Hardy Books 2
- Patrick Hawkey 1
- Patrick Stephens 44
- Patrick Stephens Limited 50
- Paul Cave 1
- Paul Elek 1
- Paul Hamlyn 11
- Paul Harris 1
- Paul Haupt 1
- Pavilion 10
- Pavilion Books 7
- Pavilion Books Limited 2
- Pavilion Books Ltd. 21
- Pavilion Children'S Books 2
- Payne And Mackinlay 1
- Payot 2
- Peak Committee Guide Book Executive 1
- Pearson 2
- Peco 2
- Peco Publications 1
- Pedigree Books Limited 78
- Peebles Press 1
- Peerage Books 1
- Pelham 1
- Pelham Books 25
- Pelham Richardson 1
- Pellerin & Cie 1
- Pembertons Publishing 1
- Pen & Sword 1
- Pen & Sword Aviation 15
- Pen & Sword Books 2
- Pen & Sword Maritime 2
- Pen & Sword Military 20
- Pen Press 1
- Pen Press Publishers Ltd. 2
- Pen-In-Hand Publishing Co. Ltd. 1
- Penarth Past Oral History Group 4
- Pendragon Partnership 1