Brands – C
- C.G. Conn
- Cable Connect
- CAD Audio
- Carlsson
- Carol
- Carry-On
- Carus Verlag
- Caruso 1877
- Cellissimo
- Cellogard
- Chamberlain Music
- Champion
- Chanson
- Chester Music
- ChopSaver
- Chord
- Christian Lindberg
- Clarity
- Clarke Tinwhistle Co.
- Clayton USA
- Clifton Edition
- Cloud Microphones
- CNB
- CodaBow
- Colophane 2000
- Concertante
- Concertiste
- Conn-Selmer
- Córdoba Guitars
- Corelli
- Corene
- Cort
- Cory
- Crafter Guitars