SWT
- Scottish Wildlife Trust
- Sheldrick Wildlife Trust
- Shropshire Wildlife Trust
- Slaithwaite railway station
- Smash World Tour
- Somerset West and Taunton
- Somerset Wildlife Trust
- South West Trains
- Southwest Texas State University
- Srowot railway station
- Staffordshire Wildlife Trust
- Standard Widget Toolkit
- Stationary wavelet transform
- Stepped-wedge trial
- Subhanahu wa ta'ala
- Suffolk Wildlife Trust
- Surrey Wildlife Trust
- Sussex Wildlife Trust
- Sweetener World Tour
- Swiftair