We consider studios those companies who develop their own videogames
Companies developing games for others are listed under Other companies
| STUDIO | CONST | MEMBERS | FOUNDED | PLACE | ACTIVITY | LINKS |
|---|---|---|---|---|---|---|
| Obscure Tales | 2-5 | 2018 | Sevilla (Sevilla) | |||
| Octavilla Games | 2-5 | 2018 | Sevilla (Sevilla) | |||
| Odders Lab | 26-50 | 2018 | Sevilla (Sevilla) | |||
| Ofihombre | 1 | 2015 | Gata de Gorgos (Alicante) | |||
| Omaet Games | 2024 | Barcelona (Barcelona) | ||||
| Omnium Lab Studios | 6-10 | 2013 | Algeciras (Cádiz) | |||
| Oniric Factor | 2-5 | 2011 | Sevilla (Sevilla) | |||
| Oniric Tales | 2025 | Valencia (Valencia) | ||||
| Open & Close | 2023 | Alicante (Alicante) | ||||
| Open House Games | 2-5 | 2019 | Barcelona (Barcelona) | |||
| Orenji Games | 2-5 | 2017 | Valencia (Valencia) | |||
| Origaming Creations | 2023 | Madrid (Madrid) | ||||
| OSEAin | 2024 | Salamanca (Salamanca) | ||||
| Otter Worlds Games | 2022 | Madrid (Madrid) | ||||
| OuroborosStudio | 2023 | Barcelona (Barcelona) | ||||
| Out of the Blue Games | 11-25 | 2018 | Madrid (Madrid) | |||
| Outfit7 Barcelona | 26-50 | 2018 | Barcelona (Barcelona) | |||
| Outlander Games | 2021 | Madrid (Madrid) | ||||
| Over the Top Games | 6-10 | 2008 | Madrid (Madrid) | |||
| OverPowered Team | 2-5 | 2014 | Madrid (Madrid) | |||
| Oxtail Games | 2024 | Barcelona (Barcelona) |