STO
STO is an abbreviation for:
- Safe torque off , a safety function of drives, see safety function #STO (Safe torque off)
- Ship engineering officer , chief section head of ship engineering on board warships
- Security through obscurity , a principle in IT security
- Service du travail obligatoire , Nazi forced labor for young French
- Slater Type Orbitals , atomic functions in quantum chemistry
- Sovet Truda i Oborony , German Council for Labor and Defense , a government body of the Soviet Union
- Star Trek Online , online role-playing game in the Star Trek universe
- Stockholm Airport , collective name for several airports in the metropolitan area of Stockholm, Sweden (according to IATA)
- Strontium titanate (SrTiO 3 )
- Svobodno tržaško ozemlje (Slovenian), Free Territory of Trieste
- Stockach district , license plate number
Sto stands for:
- Sto , manufacturer of insulation, renovation and coating systems
- Pseudonym of Sergio Tofano (1883–1973), Italian draftsman
- Sto-Ebene, a fictional location from the Discworld novels, see characters and locations from the Discworld novels # Sto-Ebene
