Publishers
- L. Mame 1
- L. Miller & Co. (Hackney) Ltd. 1
- L. Tallis 1
- L. Upcott Gill 4
- L.B. Fischer 1
- L.T.A Robinson 5
- L.T.A. Robinson Ltd. 13
- La Mille Miglia Editrice 1
- Laas International 3
- Labyrinth Press 1
- Ladybird Books 10
- Ladybird Books Ltd 7
- Lakeland Heritage Books 1
- Lamplight Publications 1
- Lamson Paragon Supply Company Ltd. 1
- Lancer International 2
- Lancer Publishers & Distributors 2
- Landmark Publishing 12
- Laneman Publishing 1
- Langdon Publishing 1
- Langford Press 4
- Lannoo Publishers 1
- Lansdowne 2
- Lansdowne Press 1
- Lapridge Publications 6
- Larousse 2
- Latimer House 2
- Latimer House Limited 7
- Latimer House Ltd. 4
- Laurels Publishing 1
- Laurence and Bullen 2
- Laurence King Publishing 1
- 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
- Leandoer & Ekholm Publishing 1
- Legend Books 1
- Lehigh Uiniversity Press 1
- Lehrmittel Possneck 1
- Leicester & County Chamber Of Commerce 1
- Leicester University Press 6
- Leicestershire Museums 1
- Leigh And District Family History Society 1
- Leo Cooper 27
- Leo S. Olschki Editore 1
- Leonard Parsons 2
- Leonaur 1
- Lerpwl 1
- Lesley Ann Cairns 1
- Leslie Frewin 2
- Lester Publishing Limited 1
- Lever Brothers Limited 1
- Lewis Publishers 2
- Lewis's Ltd. 6
- Lexington Books 4
- Leyland Cars 1
- Lgre Publications Ltd 1
- Librairie Aeronautique 1
- Librairie Armand Colin 1
- Librairie De L. Hachette Et Cie. 2
- Librairie Hachette 5
- Librairie Hachette Et Cie 2
- Librairie Jules Tallandier 1
- Librairie Larousse 1
- Librairie Payot 1
- Librairie Universelle De Mary-Muller 1
- Librarie D'Education Nationale 1
- Libreria Editrice Politecnica 1
- Libreria Editrice Vaticana 2
- Liesma Publishers 1
- Lightmoor Press 8
- Lightning Preservation Group 2
- Lightning Source Uk Ltd 1
- Lilmur Publishing 1
- Lily Publications 1
- Limited Editions 1
- Limlow Books 1
- Lindsay Drummond Ltd. 1
- Lindsay Publications 1
- Linnean Society of London 1
- Lion Publishing 2
- Literarische Anstalt Rutten & Loening 1
- Literarische Unstalt 1
- Litor Publishers Ltd. 5
- Little Brown 1
- Little Learners Inc. 1
- Little, Brown 3
- Little, Brown and Company 15
- Little, Brown And Company (Uk) Limited 1
- Littlebury & Company Ltd. 3