Group
- Nottingham Square Games1
- Novus Ordo Seclorum30
- Oathbreaker Games4
- Obatron Productions6
- Obsidian Portal1
- Octopus Gardener2
- Ohio Men of the Red Chest18
- Onyx Path Publishing2
- Onyx Path Publishing and White Wolf Publishing3
- Orc Stomp2
- Ottawa Red Shirts50
- Out of the Box1
- Out of the Box Publishing, Inc.17
- Ozarks Rising30
- PH Summoners4
- PHOENIX Interactive5
- PaintMinion1
- Paizo Publishing, LLC376
- Paladin Miniatures Studio5
- Palegain Project LLC2