Publishers
- I. Foulkes 4
- I. Harding 1
- I. Murray 1
- I.B. Tauris & Co. Ltd. 5
- I.G.S. Marine Publishers 1
- I.T. Hinton 2
- I.W. Butcher 1
- Ian & Marilyn Boumphrey 1
- Ian Allan 84
- Ian Allan Ltd. 53
- 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
- Idw 1
- IEEE Press 1
- Ifremer 1
- IGI Global 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
- Imagier Publishing 2
- Immel 2
- Impact Books 1
- Imperial Chemical Industries 3
- Impressions Of Monmouth Ltd 1
- Imprimerie De La Manufacture De La Charite 1
- Imray, Laurie, Norie & Wilson Ltd. 1
- Independent Books 1
- Independent Music Press 1
- Index 2
- Indiana University Press 8
- Indological Book House 1
- Informa Law From Routledge 1
- Ingrid, Sils 6
- Innovative Kids 3
- Inside Pocket Ltd. 2
- Inspire Creative 1
- Institue Of Fisheries Management 1
- Institut D'Ethnologie 1
- Institut D'Etudes Slaves De L'Universite De Paris 1
- Institut De Recherches Scientifiques Et Techniques 1
- Institut Des Hautes Etudes Scientifiques 2
- Institute For Strategic Studies 2
- Institute Of Cornish Studies 2
- Institute Of Historical Research 4
- Institute Of Irish Studies 4
- Institute Of Mathematical Statistics 1
- Institute Of Physics 3
- Institution Of Electrical Engineers 2
- Institution Of Naval Architects 4
- Instituto Botanico Da Universidade De Coimbra 1
- Instituto Camon Aznar 1
- Instituto Geografico De Agostini 1
- International Biggles Association 1
- International Bureau For Plant Taxonomy And Nomenclature 1
- International Correspondence Schools Ltd. 2
- International Exhibitions Foundation 1
- International Learning Systems Corporation Limited 1
- Interpet Publishing 3
- Interpress Publishers 2
- Interpresse 1
- Ion Creanga Publishing House 4
- IPC Magazines Ltd. 3
- Ipc Transport Press 1
- Iris Druck C. Weller & Co. 1
- Irish Academic Press 2
- Irish Manuscripts Commission 2
- Irish Railway Record Society 1
- Ironbridge Open Air Museum Of Steel Sculpture 1
- Ironbridge Publications 1
- Irwell Press 14
- Irwin Publishing 1
- IS Enterprises 1
- Isbister & Co. Ltd. 1
- Isbister & Company Limited 1
- Islamic Art Publications 1
- Island Press 1
- Isle of Wight Archaeological Society 1
- Istituto Bancario San Paolo Di Torino 1
- Italtel 1
- Ithaca 1
- Iucn 1
- Ivan R. Dee 1
- Iveco Image 1
- Ivor Nicholson & Watson 2
- Ivor Nicholson & Watson Ltd. 2
- Ivor Waters 4
- Ivy Leaf 1
- IWRB 1