Top Steam Game Developers - Letter O
| Name | Apps Count |
|---|---|
| Obsidian Entertainment | 110 |
| Oleg Sereda | 105 |
| OVERKILL - a Starbreeze Studio. | 84 |
| Orange_Juice | 62 |
| owlyboi | 54 |
| Overhead Games | 48 |
| Osmose Studio | 46 |
| Owlcat Games | 34 |
| Octo Games | 31 |
| Other Ocean Interactive | 26 |
| ONGAKUKAN Co.,Ltd. | 26 |
| Oxide Games | 24 |
| OnSkull Games | 23 |
| Objectif 3D | 23 |
| Ocean Software | 23 |
| Orangepixel | 21 |
| One More Level | 21 |
| Offworld Industries | 20 |
| Orcsoft | 19 |
| Onyx Lute | 18 |