Publishers
- Historica Selecta 1
- Historical Aviation Album 1
- Historical Model Railway Society 1
- Historical Publications Ltd. 6
- History Research 1
- Hitchin Historical Society 1
- Hitchin Urban District Council 2
- HMSO 34
- Hobby House Press 3
- Hodder & Stoughton 258
- Hodder & Stoughton Children's Books 2
- Hodder & Stoughton Limited 1
- Hodder Children's Books 20
- Holborn House 1
- Holiday House, New York 3
- Holland Studio Craft Ltd. 3
- Hollis & Carter 9
- Holt Rinehart & Winston 2
- Holywell Press 2
- Home Words Publishing Office 1
- Homewood Publishing Company 1
- Honda (u.K.) Ltd. 1
- Hong Kong Museum Of Art 1
- Honno 1
- Hood & Co. Limited 1
- Horace Cox 1
- Horizons De France 1
- Houghton Mifflin and Company 2
- Houghton Mifflin Company 9
- Houlston & Sons 2
- Houlston and Stoneman 1
- Howard Baker 79
- Howard Baker Press 63
- Howard Frisch 1
- HSW Print 1
- Hudson & Kearns 1
- Hudson Hills Press 2
- Hugh Evans 5
- Hugh Evelyn 2
- Hugh Henry 1
- Hughes & Son 4
- Hughes A'I Fab 3
- Hughes and Son Ltd. 2
- Hughes Griffin Press 1
- Hull City Museums 2
- Hull Museum 1
- Hulton Press 2
- Hulton Press Ltd. 6
- Humana Press 1
- Humber Paddle Steamer Group 1
- Humboldt Books 1
- Humphrey Milford 132
- Humphrey Toulmin 1
- Hungarian Technical Publishers 1
- Hunkydory Designs 1
- Hurst & Blackett 2
- Hurst & Blackett Ltd. 2
- Hurst & Co 1
- Hurtwood Press 1
- Hutchinson 19
- Hutchinson & Co. 11
- Hutchinson & Co. Ltd 17
- Hutchinson Australia 1
- Hutchinson Children's Books 5
- Hutchinson Education 1
- Hutchinson Junior Books 1
- Hutchinson Junior Books Ltd 2
- Hutchinson of London 6
- Hutchinson's Books for Young People 10
- Hutchinson's Scientific And Technical Publications 1
- Huw Morgan 1
- Hyperion 1
- Hythe Borough Council 1
- I. Foulkes 4
- I. Harding 1
- I. Murray 1
- I.B. Tauris & Co. Ltd. 4
- I.T. Hinton 2
- I.W. Butcher 1
- Ian & Marilyn Boumphrey 1
- Ian Allan 81
- Ian Allan Ltd. 50
- Ian Allan Publishing 29
- Ian Drakeford Publishing 1
- Ian Henry Publications 1
- Icon Books 2
- Icon Publishing Limited 3
- Iconplan 1
- Ideal Boilers & Radiators Ltd. 1
- IEEE Press 1
- Ifremer 1
- IGI Global 1
- Ilex Press 1
- Iliffe & Sons Limited 6
- Iliffe Books Ltd. 2
- Ilkley Racing Books 1
- Illuminata Publishers 2
- Imagerie D'Epinal 4
- Imagerie D'Epinal-Pellering & Cie 1
- Images Publishing 7