- Sonitrol Security Systems
- Sonny's
- Sonny's Auto Repair
- Sonny's Auto Sales
- Sonny's Barber Shop
- Sonnys BBQ
- Sonny's Pizza
- Sono Products
- Sonora Quest Laboratories - Patient Service Centers
- Sons of Italy
- Sonus
- Sonus Hearing Care Centers
- Sony Electronics
- Sophia's
- Sophie's Restaurant
- Sophisti-Cuts
- Sorbco Packaging
- Sorel
- SOS
- Sos Staffing
- Sotheby's
- Sotheby's International Realty
- Sound City
- Sound Connection
- Sound Design
- Sound Experience
- Sound Factory
- Sound Ideas
- Sound On Wheels
- Sound Shop
- Sound Wave
- Sounds On Wheels
- Sounds Unlimited
- Soundworks
- Soup Kitchen
- Souper Salad
- Souper Salads
- Souplantation & Sweet Tomatoes
- Source Financial