S
- Samchuly - Korea
- Santana Cycles - USA (only makes tandem bicycles)
- Saracen Cycles - UK
- Scania - Sweden (no longer makes bicycles)
- Schwinn Bicycle Company - USA
- SCOTT Sports - Switzerland
- Serotta - USA
- Seven Cycles - USA
- Shelby Cycle Company - USA (defunct)
- Simson - Germany (acquired by Industrieverband Fahrzeugbau, now defunct)
- Sinclair Research - UK
- Singer - UK (defunct)
- Sohrab - Pakistan
- Solé Bicycle Co. - USA
- Solex - France (defunct)
- Somec - Italy
- Sparta B.V. - Dutch
- Specialized - USA
- Speedwell bicycles - Australia (defunct)
- Star Cycle Company - UK
- Stearns - USA (defunct)
- Stelber Cycle Corp - USA
- Stella - France
- Sterling Bicycle Co. - USA
- Strida - UK
- Sun Cycle & Fittings Co. - UK (defunct)
- Sunbeam - UK (defunct)
- Surly Bikes - USA
- Suzuki - Japan
- Swift Folder - USA
- Swing Bike - USA (defunct)
Read more about this topic: List Of Bicycle Brands And Manufacturing Companies