Publishers – L
- L.T.P. Publishing
- La Bloemen Productions
- Lake Press
- Lakeview Music
- Lamp und Leute
- Lark in the Morning
- Latham Music
- Latin American Music Pub
- Lauren Keiser Music Publishing
- Lauren-Spencer
- Lawrence Wright Music Co
- Lawson-Gould Music Publishers
- Lazarus Edition
- Le Chant du Monde
- Learn Roots Music
- Learn To Play Music
- Learn to play publishing
- Lee Roberts Music
- Legacy Learning Systems, Incorporated
- Leonard Bernstein Music Publishing
- Les Editions M.A.C.S.
- Les Productions d'OZ
- Les Synthétistes
- Leshnoff Publishing
- Letterio Ciriaco Edizioni
- Letterland International
- Leu Verlag
- Leuchtturm1917
- Licklibrary
- Lido
- Lillenas Publishing
- Limelight Editions
- Litolff
- Little Kids Rock
- Little Piper
- Little Snoring Ltd.
- Lizzie Davis Publishing
- LMM
- London College of Music
- London Drum Company
- London Minstead Publications
- Lorenz Publishing Company
- Loux Music Publications
- Lovebird Music
- Luck's Music Library
- Ludwig Music
- Lulu.com
- Lushlife Music
- Lyrebird Music
