Publishers
- Little, Brown And Company (Uk) Limited 1
- Littlebury & Company Ltd. 3
- Live Wire 3
- Liverpool University Press 6
- Living Art Publishing 1
- Livingston Publishing Company 1
- Llanelli Borough Council 2
- Llanelli Rugby Football Club 1
- Lliswerry High School 1
- Lloyd's Of London Press Ltd. 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 7
- LOM Art 1
- Londini Gothorum 1
- London Borough Of Hammersmith 1
- London County Council 5
- London Docklands Development Corporation 1
- London Midland and Scottish Railway Company 1
- London Missionary Society 1
- London Natural History Society 1
- London Omnibus Traction Society 1
- London Topographical Society 2
- London Transport 3
- London Underground Ltd. (Northern Line) 1
- Lone Pine Publishing 2
- Longacre Press 5
- Longacre Press Ltd. 5
- Longman 14
- Longman And Co. 3
- Longman Group Ltd. 1
- Longman Scientific & Technical 2
- Longman Young Books 7
- Longman, Brown, Green & Longmans 5
- Longman, Green, Longman And Roberts 2
- Longman, Green, Longman, Roberts & Green 1
- Longman, Hurst, Rees And Orme 3
- Longman, Hurst, Rees, Orme And Brown 3
- Longman, Orme, Brown, Green and Longmans 1
- Longman, Rees, Orme, Brown, and Green 2
- Longman, Rees, Orme, Brown, Green & Longman 2
- Longmans 5
- Longmans (Dorchester) Ltd. 1
- Longmans, Green & Co. 58
- Longmans, Green and Co. Ltd. 1
- Lorenz Books 2
- Loring & Mussey 1
- Lothrop, Lee & Shepard Books 1
- Lothrop, Lee & Shepard Co. 3
- Louisiana State University Press 1
- Lourenco Marques 1
- Lovat Dickson Limited 1
- Lovell Reeve 1
- Lowe 1
- Loykey & Lillybit 1
- Lro Publications Ltd 1
- Lucebaits Publishing 1
- Luciano Ferriani Editore 1
- Ludion, Museum 1
- Lufthansa German Airlines 1
- Lugi Reverdito Editore 1
- Lund Humphries 8
- Lutterworth Press 75
- Lynne Rienner 1
- Lynx 1
- Lynx Edicions 8
- Lyons Press 1