- O is for Obliteration
- O Mundo de Augusto
- O papagaio que não sabia falar
- O Real Tarot
- O'zapft is! - Oktoberfest Labyrinth 2016
- O-ZONE - Protect the Earth
- O2Jam - Music & Game
- Oakley's Adventure
- Obake-Touch
- Obama 2022
- Object Hunt
- Oblivion – The Black Hole – Mission Oblivion
- OC Penguin
- Occupy the castle
- Ocean Animals Coloring Book - for Kids
- Ocean Block Puzzle - Fish
- Ocean CleanUp !!
- Ocean Doctor - Sea Fish Rescue
- Ocean Fish Evolution
- Ocean Fish Mania - Best Ocean Blast Match 3 Game
- Ocean Fish Mania - Best Ocean Blast Match 3 Game
- Ocean Healers
- Ocean Hunter
- Ocean Jewel Dicover
- Ocean Splash Match 3
- Oceanic Dash
- Octagon 1: Maximal Challenge
- Octagon 2: Extreme Evolution
- Octagon: Rolling Ball 360
- Octagor
- Octo Curse - Pirate Quest
- Octopus Bump
- Octopus Defender
- Octopus Jump Challenge
- Octopus Prime
- Octopus - the cave
- Octopussy Explorer
- Odd Cat Out
- Odd Emoji 3D
- Oddbods Live Coloring (AR)
- Oddbods VR
- Oddly Satisfying Games 3D! WOW
- Oddman
- Odo's Kite
- Off Road Challenge 3D
- Off the leash: Run & Jump dog
- Off the Rails 3D
- Off-road Animal Transport
- Off-Road Bike Racing!
- Office Chaos
- Office Chaos!
- Office Clerk
- Office Floors' Management
- Office Run 3D
- Office Thief - Escape Puzzle
- Offroad 4x4 Driving
- Offroad Dessert Trucks Racing
- Offroad Hill Oil Tanker