Brands – C
- C.G. Conn
- Cable Connect
- CAD Audio
- Campanilla
- Carlsson
- Carol
- Carry-On
- Carus Verlag
- Caruso 1877
- Cascha Verlag
- Cellissimo
- Cellogard
- Chamberlain Music
- Champion
- Chanson
- Chester Music
- ChopSaver
- Chord
- ChordBuddy Media
- Christian Lindberg
- Claire Schmid Verlag
- Clarity
- Clarke Tinwhistle Co.
- Cleartone
- Clifton Edition
- Cloud Microphones
- CNB
- CodaBow
- Colophane 2000
- Comosono
- ConBrio
- Concertante
- Conn-Selmer
- Corelli
- Cort
- Coruss
- Cory
- Crescendo Hearing Protection
- Cube Acoustics
