Publishers
- Jane's Yearbooks 1
- Janet Axten 1
- Janus Publishing Co. 1
- Japonica Press 1
- Jarrold & Sons 6
- Jarrold and Sons Limited 3
- Jarrolds 8
- Jarrolds Publishers 4
- Javelin Books 1
- Jean Cauwel 1
- Jean Fran. Josse 1
- Jean John 1
- Jean-Luc Baroni Ltd. 1
- Jeremy P. Early 1
- Jlf Marketing 1
- Joh. Enschede En Zonen Grafische Inrichting Bv 1
- Johann Ambrosius Barth 1
- John & Edward Bumpus Ltd 1
- John A.S. Hambley 4
- John Adams Toys 1
- John And Robert Maxwell 2
- John Anderson 1
- John Baker 1
- John Bartholomew & Son Limited 1
- John Bellows 1
- John Bellows Ltd. 1
- John Bowyer Nichols And Son 4
- John C. Nimmo 1
- John Camden Hotten 5
- John Cocking Swiss Book Service 1
- John Crowther 2
- John Davies 1
- John Day 1
- John Donald 1
- John Donald Publishers Ltd. 1
- John E. Southall 2
- John Easter Roberts 1
- John F. Shaw 4
- John F. Shaw & Co Ltd. 36
- John F. Shaw & Co. 16
- John Fairfax & Sons 1
- John Gifford Ltd. 2
- John Hallewell Publications 1
- John Hamilton 14
- John Hamilton Ltd. 21
- John Harris 4
- John Henry Parker 1
- John Heywood 1
- John Johnson 1
- John Lane 4
- John Lane The Bodley Head 53
- John Lane The Bodley Head Limited 27
- John Lehmann 1
- John Leng 7
- John Leng & Co. Ltd. 6
- John Long 1
- John Mason 1
- John Mathew Gutch 1
- John Miller 1
- John Murray 47
- John Murray (publishers) Ltd. 2
- John Peters, The Woodcock Press 1
- John Player & Sons 1
- John Pryse 2
- John Searight 1
- John Snow 1
- John Swain & Son Limited 17
- John Van Voorst 8
- John W. Barnes Jr. Publishing Inc 1
- John W. Parker 1
- John Weale 1
- John Weatherhill 1
- John White 1
- John Wiley & Sons 38
- John Wiley & Sons Ltd. 3
- John Wylie & Co 1
- Joint Nature Conservation Committee 1
- Jonathan Cape 136
- Jonathan Clark Fine Art 1
- Jonathan Thompson 1
- Jones & Co 2
- Jones And Co. 1
- Joseph Johnson 1
- Joseph Lucas Ltd. 1
- Joseph Masters 1
- Joseph Swan 1
- Joseph Thomas 1
- Joseph Williams 1
- Joseph Williams Limited 1
- Joseph, Myers & Co. 1
- Joshua Morris Publishing 1
- Journal-Verlag 1
- Jr Marketing 2
- Judy Piatkus (publishers) Limited 2
- Julia MacRae Books 14
- Julian Messner Inc. 1
- Julius Springer 3
- Juniper House Library 1
- Juvenile Productions 2
- Juvenile Productions Ltd. 29