| Ohio Youth Basketball LLC | 🍎 | 1 | 4.8★ | Sports |
| OhioHealth | 🍎 | 1 | 4.7★ | Medical |
| Ohkubo Yuhei | 🍎 | 1 | 4.7★ | Social Networking |
| Ohm | 🍎 | 1 | 5.0★ | Business |
| OhmyNews | 🍎 | 1 | 4.3★ | News |
| Ohmyun Kwon | 🍎 | 1 | 2.6★ | Lifestyle |
| Ohte, Inc. | 🍎 | 1 | 4.5★ | Games |
| Oilfield Tracking Services LLC | 🍎 | 1 | 5.0★ | Productivity |
| Oioo | 🍎 | 1 | 2.3★ | Lifestyle |
| Oise Mobilité | 🍎 | 1 | 4.7★ | Travel |
| Oishi kenko Inc. | 🍎 | 1 | 4.2★ | Health & Fitness |
| Ojai Media LLC | 🍎 | 1 | — | News |
| Oji Setyawan | 🍎 | 1 | — | Photo & Video |
| OkCupid | 🍎 | 1 | 4.3★ | Lifestyle |
| OkMeet Limited | 🍎 | 1 | 4.6★ | Lifestyle |
| Okan Aktas | 🍎 | 1 | — | Games |
| Okan Kafali | 🍎 | 1 | 5.0★ | Food & Drink |
| Okan Yalcin | 🍎 | 1 | — | Utilities |
| Okapi Yazilim | 🍎 | 1 | 4.6★ | Photo & Video |
| Okeenea | 🍎 | 1 | — | Navigation |
| Okidokico Entertainment Inc. | 🍎 | 1 | — | GAMES_SPORTS |
| Okkar Thet Naing | 🍎 | 1 | 5.0★ | Entertainment |
| Okkes Aksoy | 🍎 | 1 | 5.0★ | Utilities |
| Okko OOO | 🍎 | 1 | 4.7★ | Entertainment |
| Oklahoma Bank & Trust | 🍎 | 1 | 4.8★ | Finance |
| Oklahoma City Thunder | 🍎 | 1 | 4.0★ | Sports |
| Oklahoma Mesonet | 🍎 | 1 | 4.2★ | Weather |
| Oklahoma Tourism and Recreation Department | 🍎 | 1 | 4.7★ | Travel |
| Oksana Motovilova | 🍎 | 1 | 4.8★ | Games |
| Oksana Petrenko | 🍎 | 1 | 4.2★ | Utilities |
| Oksana Safronenko | 🍎 | 1 | 4.6★ | Health & Fitness |
| Oksana Voloshyna | 🍎 | 1 | — | Games |
| Okto Official | 🍎 | 1 | 3.7★ | Utilities |
| Oktunc Guloglu | 🍎 | 1 | 5.0★ | Finance |
| Okudu | 🍎 | 1 | 4.8★ | Book |
| Ola Party Japan Co., Ltd. | 🍎 | 1 | 5.0★ | Entertainment |
| Olaba Gomati | 🍎 | 1 | — | Utilities |
| Olan AT&S | 🍎 | 1 | 4.0★ | Reference |
| Olanrewaju Lawanson | 🍎 | 1 | 5.0★ | Health & Fitness |
| Old Bridge Township Public Schools | 🍎 | 1 | 3.8★ | Education |
| Old Cake Factory GmbH | 🍎 | 1 | 4.7★ | GAMES_SIMULATION |
| Old Mutual Life Assurance Company | 🍎 | 1 | 5.0★ | Finance |
| Old National Bank | 🍎 | 1 | 4.7★ | Productivity |
| Old Second National Bank | 🍎 | 1 | 4.7★ | Finance |
| Old Skull Games | 🍎 | 1 | 4.7★ | Games |
| Ole Interactive | 🍎 | 1 | 3.0★ | Sports |
| Ole Michelsen | 🍎 | 1 | 4.6★ | Games |
| Oleaftech | 🍎 | 1 | 4.3★ | Reference |
| Olecsii Chechel | 🍎 | 1 | — | Food & Drink |
| Oleg Alekseenko | 🍎 | 1 | 4.9★ | Utilities |