- Other Side
- Otis Elevator
- Otis Spunkmeyer
- Otis Spunkmeyer Cookies
- Otolaryngology Associates
- Otter Tail Power Company
- Our Coop
- Our Daily Bread
- Our Father's House
- Our House Assisted Living
- Our Lady of Fatima Hospital
- Our Lady of Good Counsel
- Our Lady of Guadalupe
- Our Lady of Lourdes
- Our Lady of Lourdes Rectory
- Our Lady of MT Carmel
- Our Lady of Victory
- Our Place Restaurant
- Out Of The Blue
- Out of the Closet Thrift Store
- Out of the Woods
- Out On A Limb
- Out To Lunch
- Outback Steakhouse
- Outback Steakhouse - Regional Office
- Outboard Shop
- Outdoor Adventures
- Outdoor Connection
- Outdoor Creations
- Outdoor Environments
- Outdoor Lighting Perspectives
- Outdoor Power
- Outdoor Power Equipment
- Outdoor Services
- Outdoor Solutions
- Outdoor World
- Outdoorsman
- Outer Limits
- Outhouse