- OiTEZ eScope
- OJ Microline® UWG4
- Oji Sushi
- OJO sun&glasses
- Ojoy watch
- OK CAM Plus
- OK Cashbag
- OK Frame
- OK Kosher Food Guide
- OK Located
- OK to Shop
- OK! Sushi & Wok | Ульяновск
- Okabe Teeny
- OKAG Mobile
- OKAKEN HOME [オカケンホーム]
- Okalm
- Okalm Driver
- Okalm Partners
- Okaloosa Walton Parade
- Okami Sushi
- Okanagan Lakefront Resort
- Okar Phone
- Okar Phone
- OKAS Pro for iPhone
- Okasha Smart
- OKATADUKE
- OKATADUKE2
- Okay Disco (official)
- OKAY.COM – HK Property Agent
- OkayHai Online Shopping
- Okaz
- Okazii.ro
- Okbodyboards
- Resolved Ministries
- OKC American Cleaners
- OKC Community Church
- OKC Golf & Country Club
- OkeruAR
- Okey Plus
- OKHOME
- OKHTEIN
- OKIDO
- Okii moji
- OKIN Comfort Bed
- OkinComfortBed Ⅱ
- OKIN Smart Bed
- OKIN-Seating
- Okinawa Adairsville
- OKIS BrowBook
- OKKAMI
- Okki - Find services near you
- Oklahoma Senior Journal
- Oklahoma Sooners Stickers PLUS for iMessage
- Oklahoma Wine Trails
- OKLOK+
- Oklyn
- OKmart
- OkMeet: Hook up, Dating, Chat
- Okoia Scale
- OKOK Nutrition
- OKOK智能
- OKOK计量
- Okos Smart
- Okotoks Alliance Church