4S
4S may refer to:
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Places
- 4S Ranch, California, an unincorporated community in San Diego County
Other uses
- iPhone 4S, the 5th generation of the iPhone
- Scandinavian Simvastatin Survival Study, a multicenter clinical trial that was performed in 1990s in Scandinavia
- Society for Social Studies of Science, a non-profit scholarly association devoted to the social studies of science and technology
- Toshiba 4S, a nuclear reactor
- Toyota S engine
- DS 4S, a car
- 4S, the production code for the 1977 Doctor Who serial The Talons of Weng-Chiang