S
- Safety Siphon
- Salt-Away
- Scandvik
- Schelling
- Schmitt Marine
- Sea-Dog
- Sea Choice Products
- SeaHawk Batteries
- Seakamp
- Seloc Publications
- Servus
- Shakespeare Antenna
- Shell Oil
- Sherwood
- Shields Hose
- Shurflo
- Shurhold
- Sierra
- Simrad
- SmartPlug
- Soundown
- Southco
- South Wind Designs
- Spray Nine
- Springfield Marine
- Standard Horizon
- Starbrite
- Stearns
- Stewart Warner
X
Z