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- La Tromba
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- Laney
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- Larrivee
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- Last Stand Deluxe
- Lauren
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Lauren Keiser Music Publishing
Lauren Keiser Music Publishing
- Lauten Audio
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- Leapwing Audio
- Lebayle
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- Lee Evans
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- Lee Roberts
- Legacy Learning
- Legator
- Legendary Strings
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- Leonard Bernstein Music
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- Levy's
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- Licklibrary
- Liemar Technologies
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- Limelight Editions
- Lindell Audio
- Line 6
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- Livemix
- Livewire
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- Logickeyboard
- Logitech
- Logjam
- Londoner Bows
- Loog Guitars
- Los Cabos Drumsticks
- Lounsberry Pedals
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- Lucid Audio
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