Cold Blue Music
- A record label offering experimental and post-experimental chamber and electronic music.
- http://www.coldbluemusic.com/

Catch and Release Recording Collective
- A non-profit label dedicated to releasing underground and new music, and creating new collaborative projects. MP3s of some material available.
- http://catch-and-release.org/

Clone
- Dutch record label and shop specializing in experimental/underground electronic dance music.
- http://www.clone.nl/

Constellation Records
- Label that is home to artists including Godspeed You Black Emperor, A Silver Mt. Zion, Frankie Sparo, and Exhaust.
- http://www.cstrecords.com/index.html

City Slang
- UK label playing home to bands such as To Roccoco Rot, Lambchop, Experimental Pop Band, and Tortoise.
- http://www.cityslang.com/

Cunieform Records
- Experimental, ambient, unusual and avant-garde label featuring artists such as Birdsongs of the Mesozoic, The Danubians, and Soft Machine.
- http://cuneiformrecords.com/