Publishers
- Landmark Publishing 11
- Laneman Publishing 4
- Langford Press 4
- Lannoo Publishers 1
- Lansdowne 2
- Lansdowne Press 1
- Lapridge Publications 5
- Larousse 2
- Latimer House 1
- Latimer House Limited 7
- Latimer House Ltd. 7
- Laurels Publishing 1
- Laurence and Bullen 2
- Laurence King Publishing 2
- Laurence Oxley 1
- Lawrence & Jellicoe Ltd. 1
- Lawrence and Bullen 3
- Lawrence And Bullen Ltd. 2
- Lawrence Erlbaum 1
- Ldr Publications 1
- Le Centre National De La Recherche Scientifique 2
- Le Cherche Midi Editeur 1
- Le Lettere 1
- Le Monde De L'Art 1
- Leadenhall Prefs. Ltd. 1
- Leader Books 1
- Leading Edge Press and Publishing 1
- Legare Street Press 1
- Legend Books 1
- Lehigh Uiniversity Press 1
- Lehrmittel Possneck 1
- Leicester & County Chamber Of Commerce 1
- Leicester University Press 8
- Leicestershire Museums 1
- Leigh And District Family History Society 1
- Leo Cooper 22
- Leo Van Den Ende 1
- Leonard Parsons 3
- Leonaur 1
- Leopard's Head Press 1
- Lerpwl 1
- Leslie Frewin 2
- Lester Publishing Limited 1
- Letchworth Naturalists' Society 2
- Letteren & Kunst 1
- Lever Brothers Limited 1
- Lewis Publishers 2
- Lewis's Ltd. 6
- Lexington Books 3
- Leyland Cars 1
- Librairie Aeronautique 1
- Librairie Armand Colin 1
- Librairie De L. Hachette Et Cie. 1
- Librairie Hachette 4
- Librairie Hachette Et Cie 2
- Librairie Jules Tallandier 1
- Librairie Larousse 1
- Librairie Payot 1
- Librairie Universelle De Mary-Muller 1
- Libreria Editrice Politecnica 1
- Libreria Editrice Vaticana 1
- Liesma Publishers 1
- Lieux Dits Editions 1
- Light Rail Transit Association 3
- Lightmoor Press 5
- Lightning Preservation Group 2
- Lightning Source Uk Ltd 1
- Lilmur Publishing 1
- Limlow Books 1
- Lindsay Drummond Ltd. 1
- Lindsay Publications 1
- Linnean Society of London 1
- Lion Publishing 1
- Literarische Anstalt Rutten & Loening 1
- Literarische Unstalt 1
- Litor Publishers Ltd. 5
- Little Brown 1
- Little Learners Inc. 1
- Little, Brown 1
- Little, Brown & Co. 1
- Little, Brown and Company 13
- 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