4S
# 4S

4S may refer to:

## 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
