Video games list — letter O
- Overwatch 2
- Overwatch
- Osu!
- Outlast
- Onmyoji Arena
- Old School RuneScape
- Off The Grid
- Outward
- One Piece Bounty Rush
- Oxide Survival Island
- ONE PIECE: PIRATE WARRIORS 4
- Overcooked 2
- One State RP - Life Simulator
- OMORI
- One Night at Flumpty's 3
- Ori and the Will of the Wisps
- Once Human
- One Piece: Pirate Warriors 3
- One Piece: Burning Blood
- One Punch Man - The Strongest
- One Piece World Seeker
- Oasis
- One Piece: Unlimited Adventure
- OTR - Offroad Car Driving Game
- Outlast 2
- One Piece Treasure Cruise
- Outlanders
- One Piece Odyssey
- One-Punch Man: A Hero Nobody Knows
- Overcooked
- Otherworld Legends
- Os Aventureiros RUN