Ojet Records
- Austin, Texas indie; artists include Schrasj, Lucky Motors and Mathlete. Includes a list of signed bands, tour dates, and sound clips.
- http://www.ojet.com/site/index.html

Oddio Records
- Pennsylvania label. Artists include Dive, Godhead Disciple, and The Worry Knot. News, catalog, mailing list, and online store.
- http://www.oddiorecords.com/

ObliqSound
- New York and Hamburg-based label. Streaming audio tracks, online shop, artist news, MP3 downloads and company profile.
- http://www.obliqsound.com/

Orleans Records
- Based in New Orleans, Louisiana. Artists include Danny Barker, Tony Green, and Guitar Slim Jr. Ordering, reviews, and mailing list.
- http://orleansrecords.com/

Old 3C Records
- Columbus, Ohio indie. Home of Log and Great Plains. Discography, tour dates, and ordering information.
- http://www.old3c.com/

Old Pants
- Denver, Colorado indie. Artists include Tech T., Sherwen, and Chad Steele. MP3s, discography, and links.
- http://www.oldpants.com/