- Octagon VR
- Octagon: Rolling Ball 360
- Octagor
- Octo Curse - Pirate Quest
- OCTO Logic Puzzle
- October Style Dress Up - Makeover game for girls
- Octobo Fun & Games
- Octodad: Dadliest Catch
- OctoFurry
- OctoHits
- Octojump
- Octopus Bump
- Octopus Coming
- Octopus Defender
- Octopus Evolution
- Octopus Hunter
- Octopus Jump Challenge
- Octopus Machine
- Octopus Prime
- Octopus Run!
- Octopus Shooter
- Octopus - the cave
- Octopussy Explorer
- Octopuz
- OctoThief
- Poker Game Online: Octro Poker
- Octro Tambola Housie Online
- Octus HUB
- Octus HUB
- Oculux
- Odd and Even numbers
- ODD Ball
- Odd Bot - Holdem Odds
- Odd Bot Out
- Odd Cat Out
- Odd Color - Test Your Color Vision
- Odd Colour
- Odd Emoji 3D
- Odd Emoji Out game
- Odd Eye.
- Odd Mission
- Odd One Out - Trivia Quiz Game
- Odd one out game
- Odd one out What does not belong for kindergarten kids
- Odd One Out Zebra Free
- Odd Ones Out!
- Odd Out - The Brain Game
- Odd Socks
- OddBalls
- Oddbods Dominoes
- Oddbods Live Coloring (AR)
- Oddbods Oddlife: Daily games
- Oddbods VR
- OddColorPicker -watch game-
- Oddly Satisfying Games 3D! WOW
- Oddly Satisfying Sand Art!
- Oddly Satisfying Soap Cutting!
- Oddman
- Oddmar
- Oddmar+
- Odds Are for Messages
- Odds Calculator Poker
- OddSwipe - A minimalistic fast paced logical game where quick thinking is key!
- Oddworld: Munch's Oddysee
- Oddworld: Munch's Oddysee TV
- Oddworld: New 'n' Tasty
- Oddworld: Stranger's Wrath
- Oddworld: Stranger's Wrath TV
- Ode To Heroes
- Oden Cart 2 A Taste of Time
- Oden Cart 4
- Oden Cart A Heartwarming Tale
- Oden Master
- Odesys FreeCell Solitaire
- Odesys Golf Solitaire
- Odesys Pyramid Solitaire
- Odesys Solitaire
- Odesys Spider Solitaire
- Odesys Yukon Solitaire
- ODINsWORLD
- ODISSEU
- Odo's Kite