Games | O
- Observation
- Observer
- Observer: System Redux
- Octopath Traveler
- Oddity
- Oddworld Soulstorm
- Odin Sphere Leifthrasir
- Offworld Trading Company
- Ogre Battle
- Ogre Battle: March of the Black Queen
- Okami HD
- Olija
- Omensight
- Onimusha: Warlords
- Oninaki
- Ooblets
- Opus Magnum
- Orcs Must Die! 3
- Ori and the Blind Forest
- Ori and the Will of the Wisps
- Othercide
- Otogi 2: Immortal Warriors
- Otogi: Myth of Demons
- Outer Wilds
- Outlast 2
- Outlast Trinity
- Outriders
- Over the Alps
- Overcooked
- Overcooked 2
- Overcooked! All You Can Eat
- Overkill's The Walking Dead
- Overland
- Overwatch
- Overwatch 2
- Owlboy
- Oxenfree
- Oxygen Not Included