Publishers 12,114
| Publisher | Games | Queer flag | Country |
|---|---|---|---|
| Olayaselection AB | 1 | -- | |
| Old Casa Games | 1 | -- | |
| Old Dreamer Press | 1 | -- | |
| Old Friends Games | 1 | -- | |
| Old Glory | 1 | -- | |
| Old Guard Publishing | 1 | -- | |
| Old Hen Games | 1 | -- | |
| Old Holborn | 1 | -- | |
| Old Novel Games | 1 | -- | |
| Old School Sports | 1 | -- | |
| Old Teddys | 1 | -- | |
| Old Wizards' Playtime Company | 1 | -- | |
| OldGames | 1 | -- | |
| OldeBijvank.com | 1 | -- | |
| Oliver Games (I) | 1 | -- | |
| Oltha Editora | 1 | -- | |
| Olves Spiele | 1 | -- | |
| Olympic | 1 | -- | |
| Olympic Card Company | 1 | -- | |
| OmniMind Games | 1 | -- | |
| Omnia | 1 | -- | |
| Omnigames | 1 | -- | |
| On Target Games | 1 | -- | |
| On Trend Goods | 1 | -- | |
| OnTopGames | 1 | -- | |
| Once Upon a Game | 1 | -- | |
| One Clever Crow | 1 | -- | |
| One Eye Productions | 1 | -- | |
| One Line Games Lab | 1 | -- | |
| One Man Act Games | 1 | -- | |
| One Method Monkey | 1 | -- | |
| One More Round Games | 1 | -- | |
| One Scoop Games | 1 | -- | |
| One Table Games | 1 | -- | |
| One Tap Trivia | 1 | -- | |
| One for All | 1 | -- | |
| One of Each Productions, LLC | 1 | -- | |
| Oneliner Ltd. | 1 | -- | |
| Oneupmanship | 1 | -- | |
| Onion Squire | 1 | -- | |
| Onrizon | 1 | -- | |
| Onsworld | 1 | -- | |
| Onyx Path Publishing | 1 | -- | |
| Onyx Tales Editions | 1 | -- | |
| Onyx éditions | 1 | -- | |
| Opa! Games | 1 | -- | |
| Open Board Games | 1 | -- | |
| Open Door Games | 1 | -- | |
| Open Field Games | 1 | -- | |
| Open Road Games | 1 | -- |