- stirred tank bioreactor
- stirred yoghurt
- stirrer
- stirring
- stirring device
- stirring pin
- stirring power
- stirrup
- stirrup bender
- stirrup curve
- Stirruped Pottery Horse from a Tomb of the Jin Dynasty at Nanjing
- STIS
- stishovite
- stitch
- stitch-bonding machine
- stitch-forming structure
- stitching double weave
- stitching sewing machine
- stitching system
- STJ
- STJ detector
- Stjepan Mesić
- St. John crater
- St John's Cathedral at Hong Kong Central Garden
- St.John's University