| STU | Saigon Tech University 
| Others |
| STU | Saint Thomas University
| Others |
| STU | Same To U
| Others |
| STU | Santa Cruz, Belize
| Others |
| STU | Scent Transfer Unit
| Others |
| STU | Scoville Thermal Units
| Others |
| STU | Secure Telephone Unit
| Others |
| STU | Secure Telephone Units
| Others |
| STU | Separate Technical Unit
| Others |
| STU | Set Top Unit
| Others |
| STU | Shepherdnick Tobeon Updates
| Others |
| STU | Shock Treatment Unit
| Others |
| STU | Short Term Unemployed
| Others |
| STU | Shut The Up
| Others |
| STU | Shuttle Test Unit
| Others |
| STU | Singapore Teachers Union
| Others |
| STU | Smart Telecontrol Unit
| Others |
| STU | So Turnt Up
| Others |
| STU | Sonic Timeworks Utilities
| Others |
| STU | Sorry, Time's Up
| Others |
| STU | Space Time Unit
| Others |
| STU | Special Task Unit
| Others |
| STU | Special Team Unit
| Others |
| STU | Special Test Unit
| Others |
| STU | SRAM Technical University
| Others |
| STU | St Thomas University
| Others |
| STU | St. Thomas University
| Others |
| STU | Stamina Training Unit
| Others |
| STU | Star Tracker Unit
| Others |
| STU | State Transmission Utility
| Others |
| STU | State Transport Undertaking
| Others |
| STU | Steem Token Unit
| Others |
| STU | Steven Universe
| Others |
| STU | Strategic Technology Unit
| Others |
| STU | Streaming Tape Unit
| Others |
| STU | Street Touring Ultra
| Others |
| STU | Stuart
| Others |
| STU | Studebaker
| Others |
| STU | Student Transport Unit
| Others |
| STU | Stupid Talking Unit
| Others |
| STU | Subaqueous Twinpedal Unit
| Others |
| STU | Supervision Training Units
| Others |
| STU | Support The Uprise
| Others |
| STU | System Testing Unit
| Others |