| SIS | IEEE Swarm Intelligence Symposium 
| Others |
| SIS | Italian Society of Women Historians
| Others |
| SIS | Psion Software Installation file
| Others |
| SIS | Safety Instrumented System
| Others |
| SIS | Safety Instrumented Systems
| Others |
| SIS | SAIL (Shuttle Avionics Integration Laboratory) Interface System
| Others |
| SIS | Sales Information Standard
| Others |
| SIS | Sales Information System
| Others |
| SIS | Salin Infusion Sonography
| Others |
| SIS | Saline Infusion Sonography
| Others |
| SIS | Saratoga Independent School
| Others |
| SIS | Satellite Information System
| Others |
| SIS | Satellite Informations Service
| Others |
| SIS | Saws Information System
| Others |
| SIS | Scalable Internet Services
| Others |
| SIS | Scaleway Infinite Storage
| Others |
| SIS | Scanning Imaging Spectrometer
| Others |
| SIS | Scanscope Image Set
| Others |
| SIS | Schengen Information System
| Others |
| SIS | School Internet Server
| Others |
| SIS | School of Information Sciences
| Others |
| SIS | School of International Service
| Others |
| SIS | Schoolnet Internet Server
| Others |
| SIS | Science In Sport
| Others |
| SIS | Science Information Systems
| Others |
| SIS | Scientific information service
| Others |
| SIS | Scientific Instrument Services
| Others |
| SIS | Scientific Instrument Society
| Others |
| SIS | Scientific Investigation Study
| Others |
| SIS | Screening Information System
| Others |
| SIS | Scripture In Song
| Others |
| SIS | Secret Intelligence Service
| Others |
| SIS | Secure Identity Services
| Others |
| SIS | Secure Internet Services
| Others |
| SIS | Security and Intelligence Services
| Others |
| SIS | Security Industry Specialists
| Others |
| SIS | Selective Identification System
| Others |
| SIS | Self Injury Song
| Others |
| SIS | Self Injury Support
| Others |
| SIS | Self Isolation Scheme
| Others |
| SIS | Senior Intelligence Service
| Others |
| SIS | Sensoric Infeed System
| Others |
| SIS | Sequential Importance Sampling
| Others |
| SIS | Serial Input Special
| Others |
| SIS | Service Industry Specialists
| Others |
| SIS | Service Information System
| Others |
| SIS | Services Information System
| Others |
| SIS | SETI (Search for Extra-Terrestial Intelligence) Intercept System
| Others |
| SIS | Seven inch Series
| Others |
| SIS | Share In Savings
| Others |
| SIS | Sharjah Indian School
| Others |
| SIS | Shekou International School
| Others |
| SIS | Shimano Index Shifting
| Others |
| SIS | Shimano Indexed Shifting
| Others |
| SIS | Shimano Indexed System
| Others |
| SIS | Short Interval Scheduling
| Others |
| SIS | Short-Interval Scheduler
| Others |
| SIS | Shuttle Information System
| Others |
| SIS | Shuttle Interface Simulator
| Others |
| SIS | Side Impact Sensor
| Others |
| SIS | Side Impact Sensors
| Others |
| SIS | Side Impact Simulation
| Others |
| SIS | Siemon Interconnect Solutions
| Others |
| SIS | Signal Intelligence Service
| Others |
| SIS | Silicon Integrated Systems
| Others |
| SIS | Silicone Integrated System
| Others |
| SIS | Silver Shadow
| Others |
| SIS | Simple Instruction Set
| Others |
| SIS | Simplified Interline Settlement
| Others |
| SIS | Simulator Interface System
| Others |
| SIS | Singcare International Services
| Others |
| SIS | Single Illumination System
| Others |
| SIS | Single Image Stereogram
| Others |
| SIS | Single Image Stereograms
| Others |
| SIS | Single Ink System
| Others |
| SIS | Single Instance Store
| Others |
| SIS | Single-Instance Storage
| Others |
| sis | Sister
| Others |
| SIS | Sisters In Service
| Others |
| SIS | Slovak Society for Computer Science
| Others |
| SIS | Small Inducible Secreted
| Others |
| SIS | Soccer In the Streets
| Others |
| SIS | Social Impact Statement
| Others |
| SIS | Social Information System
| Others |
| SIS | Social Information Systems
| Others |
| SIS | Social Insurance Substitute
| Others |
| SIS | Society for Iranian Studies
| Others |
| SIS | Software Implementation Specification
| Others |
| SIS | Software Installation Script
| Others |
| SIS | Software Integrated Schedule
| Others |
| SIS | Software Integration Services
| Others |
| SIS | Software Intensive System
| Others |
| SIS | Software Interface Specification
| Others |
| SIS | Solenoid Idle Stop
| Others |
| SIS | Soul In Satanist
| Others |
| SIS | Soy Integrative Support
| Others |
| SIS | Spatial Information System
| Others |
| SIS | Special Information System
| Others |
| SIS | Special Information Systems
| Others |
| SIS | Special Intelligence Service
| Others |
| SIS | Special Intelligence Support
| Others |
| SIS | Special Intelligence System
| Others |
| SIS | Special Interest Section
| Others |
| SIS | Special Interest Sections
| Others |
| SIS | Special Investigative Services
| Others |
| SIS | Specialized Information Services
| Others |
| SIS | Species Information Service
| Others |
| SIS | Spectacular International School
| Others |
| SIS | Spectrum Internet Suite
| Others |
| SIS | Spine Intervention Society
| Others |
| SIS | Spirit In Sisterhood
| Others |
| SIS | Springtime In Sweden
| Others |
| SIS | Stand for In Service
| Others |
| SIS | Stand for In Student
| Others |
| SIS | Standard Interface Specification
| Others |
| SIS | Startup Info Structure
| Others |
| SIS | State Information Service
| Others |
| SIS | Stateful Inspection System
| Others |
| SIS | Staten Island Sound
| Others |
| SIS | Statistical Information System
| Others |
| SIS | Statistics In Schools
| Others |
| SIS | Steal Ideas Shamelessly
| Others |
| SIS | Store In Store
| Others |
| SIS | STOW (Synthetic Theater Of War) Infrastructure System
| Others |
| SIS | Strategic Information System
| Others |
| SIS | Strategic Insurance Software
| Others |
| SIS | Strategic Intelligence System
| Others |
| SIS | Streamlined Inspection System
| Others |
| SIS | Structured Information Store
| Others |
| SIS | Stud In Spandex
| Others |
| SIS | Student Info System
| Others |
| SIS | Student Information Services
| Others |
| SIS | Student Information System
| Others |
| SIS | Student Information Systems
| Others |
| SIS | Student Information Systemt
| Others |
| SIS | Students In School
| Others |
| SIS | Styrene Isoprene Styrene
| Others |
| SIS | Substratum Intake System
| Others |
| SIS | Success In Science
| Others |
| SIS | Sunne In Splendour
| Others |
| SIS | Super Image Stabilizer
| Others |
| SIS | Super Intelligent Sister
| Others |
| SIS | Superconducting-Insulating-Superconducting
| Others |
| SIS | Superconductor Insulator Superconductor
| Others |
| SIS | Supplier Information System
| Others |
| SIS | Supplies Information Service
| Others |
| SIS | Supports Intensity Scale
| Others |
| SIS | Supreme International Series
| Others |
| SIS | Surabaya International School
| Others |
| SIS | Sure Independence Screening
| Others |
| SIS | Surgical Information Systems
| Others |
| SIS | Surveillance Identification Society
| Others |
| SIS | Susceptible Infective Susceptible
| Others |
| SIS | Suspended Imposition of Sentence
| Others |
| SIS | Sustainable Innovation System
| Others |
| SIS | Suzuki Indomobil Sales
| Others |
| SIS | Swiss International School
| Others |
| SIS | Symbian Installation System
| Others |
| SIS | SymbianOS Installer System
| Others |
| SIS | System Installation Suite
| Others |
| SIS | System Integration and Support
| Others |
| SIS | System Integrity Services
| Others |
| SIS | System Integrity Statement
| Others |
| SIS | Systems Integration Schedule
| Others |
| SIs | Systems Integrators
| Others |