Group
- Columbia Gaming Group1
- Commentary is Magic1
- Common Lands Associated Media 1
- Component Game System, Inc1
- Conspiracy Ink1
- Contessa1
- Continuum Games1
- Corvus Beli1
- Corvus Belli, SLL1
- Cosplacon1
- Cosplayers United Against Harassment1
- Costume By Design1
- Costumes by Design1
- Counterfeit Combat1
- Creative Evolution1
- Crit This!1
- Critical Strike1
- Critical Success Productions1
- CriticalBard1
- Critter meet up1