Audio manufacturers
- Meinl
- Meister Rubner
- Melbourne Instruments
- MeldaProduction
- Mellotron
- Melton
- Meris
- Mesa Boogie
- Metric Halo
- meychair
- MIA Laboratories
- Michael Rath
- Microtech Gefell
- Midas
- MIDI Solutions
- Midiland
- Midiplus
- Miditech
- Midland
- Milab
- Millennia
- Mipro
- Miraphone
- Mission Engineering
- Modal
- Modbap Modular
- Modular Audio Tools
- Moen
- Mojave
- Monacor
- Monkey Banana
- Moog
- Morgan Amplification
- Morley
- Morphor
- MOTU
- Muramatsu
- Muse Kinetics
- Muse Sessions
- Music Man
- Musik Hack
- Musitek
- Musser
- Mutec
- MXL
- MXR
- Myers Pickups
- Mythos Pedals
- myVolts
- n-Track
- NANO Modules
- NANO Performance
- Native Instruments
- Naturl Audio
- Neewer
- Nektar
- Nembrini Audio
- NEO Instruments
- Neotone
- Neumann
- Neunaber
- Neural DSP
- Neuratron
- Neutrik
- Neuzeit Instruments
- Neve
- Newfangled Audio
- NGL Percussion
- Ninja Tune X Erica Synths
- Nino
- Nobels
- Noble & Cooley
- NoiseWorks
- Nomad Factory
- NOVA Guitars
- Novation
- NS Design
- NTI Audio
- Nugen Audio
- Numark
- Nuvo
- Nuvo Band
- Nux
- Oberheim
- Obsbot
- Odisei Music
- Ohma World
- Ohmforce
- Okmog
- Old Blood Noise Endeavors
- OLLO Audio
- OM System
- Omnitronic
- On Trigger
- On-Stage
- One Control
- OneOdio
- Orange
- Origin Effects
- Ortega