| Acronym | Definition |
|---|
| UST | Underground Storage Tank |
| UST | University of St. Thomas (Minnesota, Texas) |
| UST | Umsatzsteuer (German: Tax) |
| UST | University of Santo Tomas (Manila, Philippines) |
| UST | Ultra Short Throw (projectors) |
| UST | Under Saddle Transducer (guitars) |
| UST | University of Science & Technology (Yemen) |
| UST | Ultra Shadow Technology |
| UST | Unofficial Soundtrack |
| UST | Universidad Santo Tomás (Chile) |
| UST | Unresolved Sexual Tension |
| UST | United States Treasury |
| UST | United Sports Technologies |
| UST | Unique Street Trucks (truck club) |
| UST | United States Testing (various locations) |
| UST | United States Treaty |
| UST | US Trust Corporation (New York, NY) |
| UST | Universal Standard Time |
| UST | Universal Standard for Tubeless (mountain bike tires) |
| UST | Unstretched |
| UST | Ultrasound Time (cataract surgery) |
| UST | Utah State Theatre |
| UST | Undergraduate Space Training |
| UST | Ultimate Solution Tools |
| UST | Unit Security Technician |
| UST | User Status Table |
| UST | Urbanna Swim Team (Manassas, Virginia) |
| UST | Ultra Sonic Testing |
| UST | Universal Systems and Technology, Inc. |
| UST | System Universal Tubeless (Mavic) |
| UST | Union Sportive Tourcoing (French sports organization) |