Publishers
- Lilmur Publishing 1
- Lily Publications 1
- Lindsay Publications 1
- Linnean Society of London 1
- Lion Publishing 1
- List And Index Society 1
- Literarische Anstalt Rutten & Loening 1
- Literarische Unstalt 1
- Litor Publishers Ltd. 5
- Little Brown 1
- Little Learners Inc. 1
- Little, Brown 2
- Little, Brown & Co. 1
- Little, Brown and Company 15
- Littlebury & Company Ltd. 2
- Live Wire 1
- Liverpool University Press 6
- Living Art Publishing 1
- Llanelli Borough Council 2
- Llanelli Rugby Football Club 1
- Lloyd's Register Of Shipping 1
- 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
- M Press (media) Ltd. 5
- M. & J. Hobbs 2
- M. And J. Hobbs 1
- M. Carey & Sons 1
- M. Macdonald 1
- M. Moreau 1
- M.A. Donohue & Co. 1
- M.D.E. Publications 1
- M.F. Feheley 2
- M.I.P.I. PUBLISHING 2
- Mabel Esther Allan 2
- MacDonald 9
- Macdonald & Co. (Publishers) Ltd. 7
- MacDonald & Evans Ltd. 1
- Macdonald and Jane's 7
- Macdonald Futura Publishers Ltd. 4
- Macdonald Orbis 1
- Macdonald Purnell 1
- MacGibbon & Kee 2