Health Club & Gym Directory - O
- Oahu YMCA Atherton-Honolulu
- Oahu YMCA Camp H.R. Erdman-Waialua
- Oahu YMCA Kaimuki-Waialae-Honolulu
- Oahu YMCA Leeward-Waipahu
- Oahu YMCA Mililani/West Oahu-Mililani
- Oahu YMCA Nu'uanu-Honolulu
- Oahu YMCA Windward-Kailua
- Oak Canyon Nature Center
- Oak Point Park
- Oceanside Pier
- Oishi Judo
- OM yoga
- Om Yoga
- Omni 41 Health Club
- One Superior Place
- Open Center Yoga
- Optimist Park Pool
- Optimum Fitness & Physiques
- Oregon Ridge Nature Center
- Out There Adventure Centre
- Owl's Creek Tennis Center
- Oz Fitness - North Spokane