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 |
|---|---|---|---|---|---|---|
| OBH Games | 2012 | San Sebastián (Gipuzkoa) | ||||
| Obscure Tales | 2-5 | 2018 | Sevilla (Sevilla) | |||
| Octavilla Games | 2-5 | 2018 | Sevilla (Sevilla) | |||
| Ocurrence Games | 2022 | Málaga (Málaga) | ||||
| Odders Lab | 26-50 | 2018 | Sevilla (Sevilla) | |||
| Oddly Shaped Pixels | 2013 | Valencia (Valencia) | ||||
| Odisea Software | 1988 | (s/d) | ||||
| Ofihombre | 1 | 2015 | Gata de Gorgos (Alicante) | |||
| Okapi Lab | 2010 | Madrid (Madrid) | ||||
| Omaet Games | 2024 | Barcelona (Barcelona) | ||||
| OMK Software | 1985 | Barcelona (Barcelona) | ||||
| Omnimonkey | 2-5 | 2013 | Madrid (Madrid) | |||
| Omnium Lab Studios | 6-10 | 2013 | Algeciras (Cádiz) | |||
| Onbox Games | 2017 | Madrid (Madrid) | ||||
| OnePixelSoft | 2013 | Sevilla (Sevilla) | ||||
| 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) | |||
| Opera Plus | 1992 | Barcelona (Barcelona) | ||||
| Opera Soft | 1986 | Madrid (Madrid) | ||||
| Opera Sport | 1990 | Barcelona (Barcelona) | ||||
| OPQA Studios | 2010 | Madrid (Madrid) | ||||
| Orenji Games | 2-5 | 2017 | Valencia (Valencia) | |||
| Origaming Creations | 2023 | Madrid (Madrid) | ||||
| OSEAin | 2024 | Salamanca (Salamanca) | ||||
| OSOM Videogames | 2011 | Palma de Mallorca (Islas Baleares) | ||||
| 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 Software | 2-5 | 2015 | Cartagena (Murcia) | |||
| Over the Top Games | 6-10 | 2008 | Madrid (Madrid) | |||
| OverPowered Team | 2-5 | 2014 | Madrid (Madrid) | |||
| Owari Studios | 2011 | Madrid (Madrid) | ||||
| OXiAB Game Studio | 2-5 | 2014 | (Barcelona) | |||
| Oxtail Games | 2024 | Barcelona (Barcelona) |