Publishers
- The Friends Of Ripon Cathedral 1
- The Game Conservancy 1
- The Gawthorn Press Limited 1
- The Geological Society 2
- The Geological Society of Glasgow 1
- The Geologists' association 2
- The Girl's Own Paper Office 4
- The Glendale Press Ltd. 1
- The Golden Cockerel Press 3
- The Governors Of The Leys School 1
- The Gower Society 2
- The Grant Educational Co. Ltd. 25
- The Greater World 1
- The Greenwich Bookshop 1
- The Grout Publishing Company 1
- The Guardian Press 1
- The Guildford Press 1
- The Gun Room Press 1
- The Hague 1
- The Haileybury Society 1
- The Hakluyt Society 1
- The Hambledon Press 1
- The Hamlyn Publishing Group 3
- The Hamlyn Publishing Group Ltd. 1
- The Hampshire Bookshop 1
- The Harcourt Press 1
- The Harvill Press 4
- The Hawthorn Press 5
- The Headquarters Of The Regiment 1
- The Health Resorts Association 1
- The Herald Press 1
- The Herbert Press 2
- The Herefordshire And Gloucestershire Canal Trust 1
- The Heritage Press 2
- The History Press 22
- The Hobnob Press 3
- The Hogarth Press 2
- The Holburne Museum, Bath 1
- The Holland Press 3
- The Home Library Book Company 3
- The Homeland Association 2
- The Honourable Society of Cymmrodorion 11
- The Hospitallers' Club Of Wales 1
- The House Of Grant Ltd. 1
- The Housman Society 1
- The Hudson River Museum 1
- The Hunt Botanical Library 1
- The Huntington Library 1
- The Hutton Press 1
- The Ilford & District Historical Society 1
- The Imaginative Book Illustration Society 3
- The Industrial Railway Society 10
- The Inkwell Press, New York 1
- The Institute of Biology 1
- The Institute Of Ceramics 1
- The Institute Of Electrical And Electronics Engineers Inc. 1
- The Institute Of Metals 1
- The Institute Of Plumbing 1
- The Institute Of Royal Engineers 1
- The Institution Of Chemical Engineers 1
- The Institution Of Mechanical Engineers 1
- The Institution Of Mining And Metallurgy 1
- The Institution Of Mining Engineers 1
- The Institution Of Structural Engineers 1
- The International Cultural Foundation Inc. 1
- The International Reptile Conservation Foundation 1
- The International Society For Mangrove Ecosystems 1
- The Interstate Printers And Publishers 1
- The Iowa State College Press 1
- The Iowa State University Press 1
- The Iron And Steel Institute 1
- The Iron And Steel Trades Confederation 1
- The J. Paul Getty Museum 1
- The Jacaranda Press 1
- The Japan Forum 1
- The Jewish Museum 1
- The John C. Winston Company 1
- The John Hopkins Press 1
- The John Hopkins University Press 1
- The Johns Hopkins Press 1
- The Joint Council Of Qualified Opticians 1
- The Jumping Bean Co. 1
- The Junior Institution Of Engineers 1
- The Kemp House Press 1
- The Kennel Club 5
- The Kerryman 1
- The King's England Press 1
- The Kobunsha 1
- The Kylin Press 1
- The Lambourn Press 1
- The Lancashire & Yorkshire Railway Society 4
- The Latymer Foundation 1
- The Law Union and Rock Insurance Company Limited 1
- The Lawrence Wright Music Co. Ltd. 1
- The Le Play Society 1
- The Leicestershire Archaeological And Historical Society 1
- The Library Press Ltd. 2
- The Light Railway Transport League 1
- The Limited Editions Club 1
- The Little Egret Press 4