| Acronym | Definition |
|---|
| STL | Steel |
| STL | Stereolithography |
| STL | Standard Template Library |
| STL | Sooner Than Later |
| STL | Special Tribunal for Lebanon |
| STL | Soil Testing Laboratory (various organizations) |
| STL | Small Town Lottery (Philippines) |
| STL | Space Technology Laboratory |
| STL | Stockage List |
| STL | Software Technologies Ltd. (Kenya) |
| STL | Slower Than Light (science fiction) |
| STL | Store Team Leader (Target stores employee title) |
| STL | String Too Long (computer programming) |
| STL | Short-Term Liquidity |
| STL | Stickler Syndrome |
| STL | State Trust Land (various locations) |
| STL | Sound Transmission Loss |
| STL | Studio Transmitter Link |
| STL | Subtitle File |
| STL | Software Testing Laboratory |
| STL | Sgi Transistor Logic |
| STL | Store Low |
| STL | Store Longword |
| STL | Style Library |
| STL | Strike Team Leader |
| STL | Standards for Technological Literacy (International Technology Education Association) |
| STL | Submerged Turret Loading |
| STL | Speed The Light (youth ministries) |
| STL | School of Teaching and Learning |
| STL | Sojourner Truth Library (New York) |
| STL | Studio-Transmitter Link |
| STL | Short-Term Loan |
| STL | Simple Template Language (computing) |
| STL | System Test Laboratory |
| STL | Silverline Technologies, Ltd. (est. 1992; India) |
| STL | Software Technology Laboratory |
| STL | Sand Trap Louver (air conditioning) |
| STL | Software Technologies Laboratory |
| STL | Savoirs, Textes, Langage (French: Knowledge, Language, Texts) |
| STL | Senior Team Leader |
| STL | Stredni Tlak (Czech: Medium Pressure) |
| STL | Singapore Telecommunications Ltd. |
| STL | Licentiate of Sacred Theology |
| STL | Science and Technology Laboratory |
| STL | Standard Tessellation Language (stereolithography) |
| STL | Special Technologies Laboratory |
| STL | Severn Trent Laboratories Ltd (UK) |
| STL | Software Tool Library |
| STL | Schottky Transistor Logic |
| STL | Science and Technology Library |
| STL | Standard Telegraph Level |
| STL | Science et Technologie du Logiciel (French: Science and Technology Software; training program; various organizations) |
| STL | Slime Time Live (Nickelodeon) |
| STL | Simulation and Test Language |
| STL | Societe des Transports de Laval (French: Laval Transit Corporation; Canada) |
| STL | Scientific Testing Laboratories, Inc |
| STL | Solaris Threading Library (Sun Microsystems API) |
| STL | Sea Train Lines, Inc. |
| STL | Sterlite Telelink Ltd (India) |
| STL | System Threat Library |
| STL | Single-Tree Language (computer theory) |
| STL | Sales, Trading & Logistics |
| STL | Slouching Toward Liverpool |
| STL | Starving-Time Limitation |
| STL | Static Test Load |
| STL | St Louis, MO, USA - Lambert-St Louis International (Airport Code) |
| STL | Standard Transmission Line Model |
| STL | Structured Template Language (C++) |
| STL | Second-Trimester Loss (obstetrics) |
| STL | Standard Training List |
| STL | St. Leonard's College (Brighton East, Australia) |