| Acronym | Definition |
|---|
| SLS | Space Launch System (US NASA) |
| SLS | Sodium Lauryl Sulfate (foaming ingredient) |
| SLS | Selective Laser Sintering |
| SLS | Surf Life Saving |
| SLS | Suelta la Sopa (Mexican TV show) |
| SLS | Simracing League System |
| SLS | Scientific Laboratory Supplies (UK) |
| SLS | Straight Line Stability (vehicle feature) |
| SLS | Self Locking System (various companies) |
| SLS | Speech Level Singing (vocal training) |
| SLS | Swiss Light Source (Paul Scherrer Institute, Zurich, Switzerland) |
| SLS | Student Life Skills (various universities) |
| SLS | Saguenay-Lac-Saint (Canadian region) |
| SLS | Shawnigan Lake School (Shawnigan Lake, British Columbia, Canada) |
| SLS | Self Lowering Suspension |
| SLS | Site License Solution |
| SLS | Superior Line Source |
| SLS | Software Licensing Services |
| SLS | Self Levelizer Suspension |
| SLS | Seville Luxury Sedan |
| SLS | Sequential Logic Systems |
| SLS | Seville Luxury Sedan (car) |
| SLS | Society of Laparoendoscopic Surgeons |
| SLS | Stanford Law School |
| SLS | Softlanding Linux System |
| SLS | Slovenska Ljudska Stranka (Slovene People's Party, Slovenia) |
| SLS | Second Level Support |
| SLS | Supplément de Loyer de Solidarité (French: Additional Rent of Solidarity; tax law) |
| SLS | SYLVANIA Lighting Services (various locations) |
| SLS | Society of Legal Scholars (UK and Ireland) |
| SLS | Service Level Specification |
| SLS | Summer Leadership School (various organizations) |
| SLS | Spacelab Life Sciences |
| SLS | Special Liquidity Scheme (Bank of England) |
| SLS | Static Light Scattering |
| SLS | Suburban Library System (Burr Ridge, IL) |
| SLS | Supplemental Loan for Students |
| SLS | Service Location Service |
| SLS | Swing Life Style |
| SLS | Sport and Leisure Studies (various schools) |
| SLS | Senior Leader Seminar (US Army) |
| SLS | Student Leadership Services |
| SLS | Studio Legale Sutti (law firm; Italy) |
| SLS | Squadron Leadership School |
| SLS | Stewart Lender Services (Stewart Title Company; Houston, TX) |
| SLS | Sjogren-Larsson Syndrome |
| SLS | Signaling Link Selection |
| SLS | Samuel L. Sessions (record labels) |
| SLS | Sequential Lateral Solidification |
| SLS | Saint Louis School (Clarksville, Maryland) |
| SLS | Satellite Landing System |
| SLS | Senior-Loken Syndrome |
| SLS | Spoken Language System |
| SLS | Space Launch Squadron |
| SLS | System Level Solutions (San Martin, California) |
| SLS | Strained Layer Superlattice |
| SLS | Side-Lobe Suppression |
| SLS | Sun Learning Services |
| SLS | Senior Living Services |
| SLS | Single Leg Stance (physical therapy) |
| SLS | Synchronous Learning System |
| SLS | School of Language Studies |
| SLS | Side-Looking Sonar |
| SLS | Speech and Language Sciences |
| SLS | Specialist in Laboratory Safety |
| SLS | Submillimeter Limb Sounder |
| SLS | Second Look Surgery (cancer) |
| SLS | Special Litigation Section (US DOJ) |
| SLS | System Level Specification (Ciena) |
| SLS | Survey Link Scheme (Economic and Social Research Council; UK) |
| SLS | Sea Level Standard |
| SLS | Student Loans Survey |
| SLS | Samurai Longsword (gaming, Lineage2) |
| SLS | Signaling Link Set (ITI) |
| SLS | Standard Link State |
| SLS | Supplemental Living Support (New Jersey) |
| SLS | Spam Lookup Service |
| SLS | Space Life Sciences Lab (NASA; formerly Space Experiment Research and Processing Laboratory |
| SLS | Single Lap Shear (stress analysis) |
| SLS | Statistical Load Summary (airline industry) |
| SLS | Sri Lanka Solidarity (Association) |
| SLS | Single Line Service (US West ISDN) |
| SLS | Standard Level of Service |
| SLS | Static Longitudinal Stability (Aircraft Handling Qualities) |
| SLS | Shared Library Service |
| SLS | Stabilized Light Source (Bellcore - Fiberoptics) |
| SLS | SSD Lazy Simulator |
| SLS | Streptococcal Lymphadenitis |
| SLS | Société de Livraison Spécialisée (French: Specialized Shipping Company) |
| SLS | Secure Localization Scheme |
| SLS | Serviceabilty Limit State |
| SLS | Stony Lake Store (Michigan) |
| SLS | Star Light Scope (night vision instrument using amplification of starlight) |
| SLS | Senior Language Specialist (Language Line Services) |
| SLS | Switch Load Software (Sprint) |
| SLS | SprintLink Services |
| SLS | Sonobuoy Localization System |
| SLS | Site Loading Specifications |
| SLS | Single Logistics System |
| SLS | Shared Laboratory Services, LC (hospitals) |