| OTT Software Solutions Limited | 🍎 | 1 | — | Sports |
| OTT Studio LLC | 🍎 | 1 | 4.0★ | Entertainment |
| OU Federal Credit Union | 🍎 | 1 | 4.8★ | Finance |
| OUALID ELBAZ | 🍎 | 1 | 2.7★ | MAGAZINES_AND_NEWSPAPERS |
| OUCH A TOUCH OF TECHNOLOGY CC | 🍎 | 1 | 1.0★ | Productivity |
| OUS Group Pte Ltd (Originally US) | 🍎 | 1 | 4.5★ | Education |
| OUTILS OBD FACILE SARL | 🍎 | 1 | 4.6★ | Utilities |
| OUTLEAP TECHNOLOGIES PRIVATE LIMITED | 🍎 | 1 | 4.9★ | Education |
| OUTtv Network Inc. | 🍎 | 1 | 2.2★ | Entertainment |
| OV Labs | 🍎 | 1 | 4.7★ | Lifestyle |
| OV MEDIA | 🍎 | 1 | 4.4★ | Productivity |
| OVERLAP PLUS, Inc. | 🍎 | 1 | 4.6★ | Book |
| OVapi | 🍎 | 1 | 5.0★ | Travel |
| OWA Digital Ltd. | 🍎 | 1 | 3.5★ | Utilities |
| OWA Holdings, Inc. | 🍎 | 1 | 4.9★ | Health & Fitness |
| OWEN DINSMORE | 🍎 | 1 | 5.0★ | Games |
| OWL GAMES LTD | 🍎 | 1 | 4.6★ | Games |
| OWN LLC | 🍎 | 1 | 4.8★ | Entertainment |
| OXES IT LLC | 🍎 | 1 | — | Shopping |
| OXYN Yazılım Sanayi ve Ticaret Limited Şirketi | 🍎 | 1 | — | Book |
| OXiGENATOR LLC | 🍎 | 1 | 4.0★ | Health & Fitness |
| OZ MARKET | 🍎 | 1 | 4.9★ | Shopping |
| OZARK SUPER VAC | 🍎 | 1 | 4.6★ | Games |
| OZCAN ERTUN | 🍎 | 1 | 4.5★ | Photo & Video |
| OZCAN TERCAN | 🍎 | 1 | — | Utilities |
| OZCELIKKAYALAR ALISVERIS MERKEZLERI PETROL TARIM VE GIDA SANAYI TICARET LIMITED SIRKETI | 🍎 | 1 | 4.7★ | Shopping |
| OZEL NPI NOROPSIKIYATRI ISTANBUL SAGLIK EGITIM DANISMANLIK YAYINCILIK INSAAT SAN VE TIC AS | 🍎 | 1 | 4.3★ | Medical |
| OZGUR SUYEL | 🍎 | 1 | 3.7★ | Reference |
| OZI GAMEMAX ENTERTAINMENT | 🍎 | 1 | — | Games |
| Oak Cliff Pilates LLC | 🍎 | 1 | 5.0★ | Health & Fitness |
| Oak Valley Family Church Inc | 🍎 | 1 | 5.0★ | Lifestyle |
| OakTree Software, Inc. | 🍎 | 1 | 4.8★ | Reference |
| Oaklawn Jockey Club, Inc. | 🍎 | 1 | 4.9★ | Sports |
| Oakworth Capital Bank | 🍎 | 1 | 4.9★ | Finance |
| Oala LLP | 🍎 | 1 | — | Education |
| Oana Gavita | 🍎 | 1 | 5.0★ | Lifestyle |
| Oanh Bui The | 🍎 | 1 | 4.2★ | Games |
| Oanh Hoang | 🍎 | 1 | 4.4★ | Travel |
| Oasis Games LTD | 🍎 | 1 | 4.9★ | GAMES_WORD |
| Oasis Scientific Inc. | 🍎 | 1 | 4.0★ | Utilities |
| Oasiz, Inc. | 🍎 | 1 | 4.5★ | Games |
| Oats Overnight, Inc | 🍎 | 1 | 3.6★ | Food & Drink |
| Ob réunion | 🍎 | 1 | 5.0★ | Sports |
| Obai Ibrahim | 🍎 | 1 | 4.2★ | Education |
| Obedience B.V. | 🍎 | 1 | 4.6★ | Lifestyle |
| Obelix Agency | 🍎 | 1 | 3.3★ | Entertainment |
| OberpfalzECHO Nachrichten | 🍎 | 1 | 3.8★ | News |
| Obimy inc. | 🍎 | 1 | 4.5★ | Lifestyle |
| Obipixel Ltd | 🍎 | 1 | 2.2★ | Utilities |
| ObjectOne Information Systems Ltd | 🍎 | 1 | 4.0★ | Entertainment |