| Abbreviation | Definition |
|---|---|
| STFB | Save The Franklin Battlefield |
| STH | Stop The Hate |
| STH | Stop The Hunger |
| STHP | SAMMinistries Transitional Housing Program |
| STING | Serving The Interests and Needs of the Gifted |
| STIR | Save The Ichetucknee River |
| STLB | South Texas LIghthouse for the Blind |
| STLH | Spirit & Truth LightHouse |
| STOP | Safe Tables Our Priority |
| STOP | Sanely Tax Our Properties |
| STORM | Save The Oak Ridges Moraine (Ontario, Canada) |
| STP | Swords To Plowshares |
| STRAHA | Short-term Rental and Hospitality Association |
| STRAIGHT | The Society To Remove All Immoral Godless Homosexual Trash |
| STRP | Sea Turtle Restoration Program |
| STS | Shoulder To Shoulder |
| STS | Societa Turistica Scientifica |
| STT | Save The Tigers |
| STV | Stop The Violence |
| SU | Scripture Union |