- ORLIŃSCY Salony Optyczne
- Ornate News Sounds - Soundboard App
- OROBOROS
- OROCHI in the HELL
- Oromo Proverbs - Mammaaksa Afaan Oromoo
- Orphek Ocean
- Orqa FPV.Connect
- Orquesta Filarmónica de Bogotá
- Orquesta Sinfónica de Galicia
- Orquestas de Galicia
- Orrery
- Orthodoxiya Radio
- Ortigas Cinemas
- Ortigas Malls
- ORTN Télé Sahel
- Orto delle Clarisse
- Ortografia Oposiciones
- Ortografía Test y Ejercicios
- Ortspiel
- Ortwein Immo
- ORU Athletics
- ORU Athletics
- Os Amiguinhos
- Os Caçadores de Lendas
- Os Livros da Maria Inês
- OSAA Live
- Osage Casino Hotel
- OSAKA GENKi PARK
- OSC Blobs – Tapioca Toys
- OSC Members
- OSC State – Tapioca Toys
- OSCam Viewer
- Oscar & Jonathan Cainer Horoscopes
- Oscar & Olivia Pirate Treasure
- Oscar Adventure
- Oscar Cinema
- Oscar the Grouch Stickers
- Oscar Winners Trivia
- OSD Control
- OSD Player
- Osheaga
- OshiBou
- OshiBou2
- OshiBouLite
- Oshiiro Calc - 5 color calculator with chemical light mode
- OSHO Transformation Tarot
- Osho Zen Tarot
- Osipostales
- Oslo i gamle dager
- Oslo Travel Guide
- Osman Ghazi Warrior Legend
- Osman Ottoman Empire Warrior
- Osmo Hot Wheels™ MindRacers
- Osmo in Space
- Osmos
- Osmos for iPad
- Osmosis Solitaire
- OSN+
- OSOK
- Osona Territori Camper
- Osprey Approach Crime