| OLEKSANDR YASHCHUK | 🍎 | 1 | 5.0★ | Health & Fitness |
| OLGA NIKOLENKO | 🍎 | 1 | 4.3★ | Education |
| OLGA RUSKEVICH | 🍎 | 1 | 4.9★ | Lifestyle |
| OLIGATE INC. | 🍎 | 1 | 3.3★ | Games |
| OLIVE BRANCH MISSIONARY BAPTIST CHURCH, INC. | 🍎 | 1 | — | Education |
| OLIVER HO WAH CHENG | 🍎 | 1 | 5.0★ | Health & Fitness |
| OLLI TECHNOLOGY CORPORATION | 🍎 | 1 | 4.1★ | Productivity |
| OMAR SHARIF | 🍎 | 1 | 4.7★ | Book |
| OMBE SURF PTY LTD | 🍎 | 1 | 5.0★ | Sports |
| OMEGA, TOV | 🍎 | 1 | 4.8★ | Shopping |
| OMER ASLAN | 🍎 | 1 | — | Music |
| OMG. I Can Meditate! Inc. | 🍎 | 1 | 4.7★ | Health & Fitness |
| OMJ Holdings Pty Ltd | 🍎 | 1 | 4.7★ | Photo & Video |
| OMNIBUD INC. | 🍎 | 1 | — | Utilities |
| OMNISULIN VIETNAM COPORATION | 🍎 | 1 | 3.2★ | Health & Fitness |
| OMOJOWO TECHNOLOGIES | 🍎 | 1 | 2.8★ | Sports |
| ON 3 MEDIA, LLP | 🍎 | 1 | 3.4★ | Sports |
| ON CO.,LTD. | 🍎 | 1 | — | Music |
| ON OFF GAMES YAZILIM VE OYUN GELISTIRME DIS TICARET ANONIM SIRKETI | 🍎 | 1 | 4.6★ | Games |
| ON PRINT | 🍎 | 1 | 3.7★ | Utilities |
| ON TECNOLOGIA DE MOBILIDADE URBANA S.A. | 🍎 | 1 | 4.4★ | Sports |
| ONA ULTIMATE SKIN | 🍎 | 1 | — | Lifestyle |
| ONA for Media Services | 🍎 | 1 | 4.5★ | Sports |
| ONARI, K.K. | 🍎 | 1 | — | Social Networking |
| ONAT YILDIZ | 🍎 | 1 | 4.8★ | Games |
| ONAY PAY, TOO | 🍎 | 1 | 4.7★ | Travel |
| ONDO LLC | 🍎 | 1 | 4.3★ | Utilities |
| ONDREI TYRYCHTR | 🍎 | 1 | 4.6★ | Sports |
| ONE Audiobooks | 🍎 | 1 | 3.8★ | Book |
| ONE BCG | 🍎 | 1 | 5.0★ | Health & Fitness |
| ONE DOSE SAGLIK TEKNOLOJILERI A.S. | 🍎 | 1 | 4.7★ | Health & Fitness |
| ONE ELEVEN HOLDINGS, LLC | 🍎 | 1 | 4.5★ | Health & Fitness |
| ONE FTS PTE. LTD. | 🍎 | 1 | 4.0★ | Utilities |
| ONE SOLUTION FOR INFORMATION TECHNOLOGY AND SOFTWARE | 🍎 | 1 | — | Food & Drink |
| ONE TWELVE GROUP PTE. LTD. | 🍎 | 1 | 5.0★ | Education |
| ONEAFRICA TECHNOLOGIES LIMITED | 🍎 | 1 | 4.2★ | Finance |
| ONECLICK GAME Co.,Ltd | 🍎 | 1 | 4.1★ | Games |
| ONEKEY LIMITED | 🍎 | 1 | 4.7★ | Finance |
| ONEMEDIC JOINT STOCK COMPANY | 🍎 | 1 | 5.0★ | Health & Fitness |
| ONEVOICE TRANSMEDIA PRIVATE LIMITED | 🍎 | 1 | — | Business |
| ONEWALLET | 🍎 | 1 | 5.0★ | Finance |
| ONEai Health | 🍎 | 1 | 4.0★ | Health & Fitness |
| ONEflight International, Inc. | 🍎 | 1 | 2.1★ | Travel |
| ONFUSE AG | 🍎 | 1 | — | Finance |
| ONKAR SINGH | 🍎 | 1 | — | Weather |
| ONLAIN FITNES, OOO | 🍎 | 1 | 4.9★ | Health & Fitness |
| ONLINE CLASSIFIEDS PAKISTAN (SMC-PRIVATE) LIMITED | 🍎 | 1 | 4.6★ | Shopping |
| ONLYOU CO., LIMITED | 🍎 | 1 | — | ENTERTAINMENT |
| ONOFFAPP | 🍎 | 1 | 4.6★ | Utilities |
| ONOSOL LLC | 🍎 | 1 | — | WEATHER |