Publishers
- Lloyds 1
- Llp 1
- Llyfra'r Annibynwyr 1
- Llyfrau Cymreig 1
- Llyfrau'r Dryw 1
- Llyfrgell Ceredigion 1
- Lochar 1
- Lockyer Davis 1
- Loewes 1
- Logaston Press 6
- Lomond Books 1
- Londini Gothorum 1
- London Borough Of Hammersmith 1
- London County Council 4
- London Docklands Development Corporation 1
- London Midland and Scottish Railway Company 1
- London Missionary Society 1
- London Natural History Society 1
- London Topographical Society 2
- London Transport 2
- London Underground Ltd. (Northern Line) 1
- Lone Pine Publishing 2
- Long Barn Books 1
- Longacre Press 4
- Longacre Press Ltd. 5
- Longman 11
- Longman And Co. 3
- Longman Group Ltd. 3
- Longman Group UK Ltd. 1
- Longman Scientific & Technical 2
- Longman Young Books 7
- Longman, Brown, Green & Longmans 3
- Longman, Green And Co. 1
- Longman, Green, Longman And Roberts 1
- Longman, Hurst, Rees And Orme 3
- Longman, Hurst, Rees, Orme And Brown 5
- Longman, Hurst, Rees, Orme, Brown And Green 2
- Longman, Orme, Brown, Green and Longmans 1
- Longman, Rees, Orme, Brown, and Green 2
- Longman, Rees, Orme, Brown, Green & Longman 2
- Longmans 3
- Longmans, Green & Co. 56
- Longmans, Green and Co. Ltd. 2
- Lorenz Books 2
- Lothrop, Lee & Shepard Books 1
- Lothrop, Lee & Shepard Co. 2
- Louisiana State University Press 1
- Lourenco Marques 1
- Lovell Reeve 2
- Lowe 1
- Loykey & Lillybit 1
- Lucebaits Publishing 1
- Lufthansa German Airlines 1
- Lugi Reverdito Editore 1
- Lund Humphries 4
- Lutterworth Press 57
- Lynne Rienner 1
- Lynx 1
- Lynx Edicions 12
- Lyons Press 1