- O is for Obliteration
- O Mundo de Augusto
- O papagaio que não sabia falar
- O$P$ (Owe Money Pay Money)
- O'zapft is! - Oktoberfest Labyrinth 2016
- O-ZONE - Protect the Earth
- O2Jam - Music & Game
- Oakley's Adventure
- Obake-Touch
- Obama 2022
- 超級大搜尋
- Oblivion – The Black Hole – Mission Oblivion
- OC Penguin
- Occupy Master
- Occupy the castle
- 海洋動物圖畫書 - 為孩子
- Ocean Block Puzzle - Fish
- Ocean CleanUp !!
- Ocean Doctor - Sea Fish Rescue
- Ocean Fish Evolution
- 海洋魚瘋狂 - 最好的海洋高爐3場比賽
- Ocean Hunter
- Ocean Hunter
- Ocean Jewel Dicover
- Ocean Splash Match 3
- Oceanic Dash
- Octagon 1: Maximal Challenge
- Octagon 2: Extreme Evolution
- Octagon: Rolling Ball 360
- Octagor
- Octav
- Octo Curse - Quest for Revenge
- Octopus Bump
- Octopus Defender
- Octopus Jump Challenge
- Octopus Prime
- Octopus - the cave
- Octopussy Explorer
- Odd Cat Out
- Odd Emoji 3D
- Odd Squad Agent Academy
- Odd Squad Build-A-Squad
- Odd Squad: Artifact Adventure
- Odd Squad: Van Dashboard
- Oddbods Live Coloring (AR)
- Oddbods VR
- Oddly Satisfying Games 3D! WOW
- Oddman
- Odo vs Bugs
- Odo's Kite
- 極限越野
- Off the leash: Run & Jump dog
- 鐵路小旅行
- 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
- 越野甜品卡車賽車
- Offroad Hill Oil Tanker