| Acronym | Definition |
|---|
| SIS➣sister |
| SIS➣Student Information Systems |
| SIS➣State Information Service (Egypt) |
| SIS➣Students in Service (est. 1997) |
| SIS➣Secret Intelligence Service (MI6) |
| SIS➣Success in Soccer (magazine; various locations) |
| SIS➣School of Information Sciences |
| SIS➣Science in Sport (nutrition) |
| SIS➣School of International Service (American University, Washington, DC) |
| SIS➣Silence Is Sexy |
| SIS➣Success in Stages (bullying intervention program) |
| SIS➣Say It Straight (Texas) |
| SIS➣Summer in Switzerland |
| SIS➣Semester in Spain (various schools) |
| SIS➣Siemens IT Solutions |
| SIS➣Stand-in-Stead |
| SIS➣Single-Instance Storage |
| SIS➣Superannuation Industry (Supervision) Act (Australia) |
| SIS➣Specialty Insurance Services (Paoli, PA) |
| SIS➣Stay-In-School (program) |
| SIS➣Schengen Information System |
| SIS➣Services Information System (North Carolina) |
| SIS➣Safety Instrumented System |
| SIS➣School of International Studies |
| SIS➣Shivas Irons Society (golf; Carmel, CA) |
| SIS➣Scientific Instrument Services (Ringoes, NJ) |
| SIS➣School of Indigenous Studies (Australia) |
| SIS➣Second-Impact Syndrome (brain injury) |
| SIS➣School of Information Systems (Singapore) |
| SIS➣Secure Information Sharing |
| SIS➣Sundaram Infotech Solutions (India) |
| SIS➣Singapore Indoor Stadium (est. 1989) |
| SIS➣Super Image Stabilizer |
| SIS➣School Internet Server |
| SIS➣System Integrity Services |
| SIS➣Single Ink System |
| SIS➣Single Image Stereograms |
| SIS➣Stateful Inspection System |
| SIS➣Silicon Integrated Systems |
| SIS➣Specialized Information Services |
| SIS➣Software Integration Services |
| SIS➣Student Information System |
| SIS➣Startup Info Structure |
| SIS➣Scalable Internet Services |
| SIS➣System Installation Suite |
| SIS➣Satellite Informations Service |
| SIS➣Supplier Information System |
| SIS➣Statistical Information System |
| SIS➣Secure Internet Services |
| SIS➣Systems Integrators |
| SIS➣Single Instance Store |
| SIS➣Services Information System |
| SIS➣Specialized Information Services (National Library of Medicine) |
| SIS➣Single Instance Store (Microsoft Windows 2000) |
| SIS➣Seisen International School (Tokyo, Japan) |
| SIS➣Strategic Infrastructure Security (computer training) |
| SIS➣Special Information Systems (US DoD) |
| SIS➣Standardiseringen I Sverige |
| SIS➣Small Intestinal Submucosa |
| SIS➣Schlumberger Information Solutions |
| SIS➣Smaller Island States |
| SIS➣Simple Instruction Set |
| SIS➣Silicon Integrated System(s) |
| SIS➣Spatial Information System |
| SIS➣Servicio de Inteligencia Naval (Italian: Naval Intelligence Service) |
| SIS➣Six-Item Screener (cognitive impairment) |
| SIS➣Stroke Impact Scale |
| SIS➣Strategic Intermodal System |
| SIS➣Strategic Information System |
| SIS➣SegainterSettle AG (Swiss Central Securities Depository) |
| SIS➣School of Information Studies |
| SIS➣Social Inclusion Strategy |
| SIS➣Shop in Shop (various companies) |
| SIS➣State Institute of Statistics |
| SIS➣Signal-in-Space (L1 or L2 signal transmitted from GPS satellites to GPS receivers) |
| SIS➣Suspended Imposition of Sentence (legal) |
| SIS➣Stuff I've Seen (Microsoft search team, Ottawa, Canada) |
| SIS➣Swarm Intelligence Symposium (IEEE) |
| SIS➣Share Incentive Scheme |
| SIS➣Single Image Stereogram |
| SIS➣Sequential Importance Sampling |
| SIS➣Software Interface Specification |
| SIS➣Special Investigations Section |
| SIS➣Superconductor/Insulator/Superconductor |
| SIS➣Shift-Invariant Space (mathematics) |
| SIS➣Security Information Systems |
| SIS➣Student Intervention Services (various schools) |
| SIS➣Society for Interdisciplinary Studies |
| SIS➣Symbian Installation System (mobile phones) |
| SIS➣Studijni Informacni System (Czech: Student Information System) |
| SIS➣Science Information Strategy (Natural Environment Research Council; UK) |
| SIS➣Seoul International School |
| SIS➣Susceptible Infected Susceptible |
| SIS➣Siemens Industrial Services (Canada) |
| SIS➣Safe Injection Site (various locations) |
| SIS➣Special Investigation Squad (TV show) |
| SIS➣Side Impact Sensor (automobiles) |
| SIS➣Standardiseringskommissionen I Sverige |
| SIS➣Species Impact Statement (environmental conservation) |
| SIS➣Shimano Index System |
| SIS➣Senior Intelligence Service |
| SIS➣Serotonin Irritation Syndrome |
| SIS➣International Workshop on Secure Information Systems (IEEE Workshop) |
| SIS➣Shekou International School (China) |
| SIS➣Simulator Interface System (US NASA) |
| SIS➣Slovak Information Service |
| SIS➣Satellite Instrument Shelter |
| SIS➣Scientific Instrument Society |
| SIS➣Safety Injection System |
| SIS➣Software Intensive System |
| SIS➣Special Interest Seminar (various organizations) |
| SIS➣Streamlined Inspection System |
| SIS➣Software Implementation Specification |
| SIS➣Semiconductor Insulator Semiconductor |
| SIS➣Schwerionensynchrotron (Gesellschaft für Schwerionenforschung mbH) |
| SIS➣Seiko Instruments Singapore (est. 1973) |
| SIS➣Senologic International Society |
| SIS➣System Infrastructure Software |
| SIS➣Sections Internationales de Sèvres (French bilingual school) |
| SIS➣Standalone Identification System (aerospace) |
| SIS➣School of Intercultural Studies (Fuller Theological Seminary, Pasadena California) |
| SIS➣Standard Interface Specification |
| SIS➣Soccer Information Systems |
| SIS➣Styrene Isoprene Styrene Block Copolymer |
| SIS➣Shipbuilding Innovation Scheme (Australia) |
| SIS➣Swedish Institute for Standards (central body for standardization) |
| SIS➣Schwab Investor Services |
| SIS➣Special Information System |
| SIS➣Space Information Systems |
| SIS➣Serviços de Informação e Segurança |
| SIS➣Safety Interlock Switch |
| SIS➣Social Indicators Survey |
| SIS➣Spacecraft Interface Simulator |
| SIS➣Simple Image Service |
| SIS➣Slope Information System (Hong Kong) |
| SIS➣Siteseeing Internet Services (Netherlands) |
| SIS➣Sound In Syncs |
| SIS➣State Intermodal System (Florida, USA) |
| SIS➣Stiftung für Internationale Solidarität und Partnerschaft |
| SIS➣Space and Intelligence Systems |
| SIS➣Sigurnosno Izvestajna Sluzba (Security and Information Service, Croatia) |
| SIS➣Skier Insurance Services |
| SIS➣Saline Infused Sonogram |
| SIS➣Standard Information System |
| SIS➣Space Inventory System |
| SIS➣System Integration and Support |
| SIS➣Stepwise Isothermal Segregation |
| SIS➣Standard Indexing System |
| SIS➣Système Information Sociale |
| SIS➣Stroudsburg Intermediate School |
| SIS➣Space Intelligence Squadron |
| SIS➣Southern Information Systems, Inc. |
| SIS➣Signalling Interworking Subsystem |
| SIS➣SCI Isolation Segment |
| SIS➣Scanning Imaging Spectrometer |
| SIS➣Saman Information Structure (Iran) |
| SIS➣Sensor Image Simulator |
| SIS➣Superconducting Image Surface |
| SIS➣Signatured Instruction Stream |
| SIS➣Servicios Israelis de Seguridad (Guatemalan security firm) |
| SIS➣Simposio de Ingeniería de Software |
| SIS➣Simple Internet Solutions |
| SIS➣Synopsis Information System (DCAA) |
| SIS➣Selective Inquiry System |
| SIS➣Satellite Intercept System |
| SIS➣Strategic Intelligence Summary |
| SIS➣Surface-ionization-type Ion Source |
| SIS➣Site Integrated Schedule |
| SIS➣Single Interceptor Satellite |
| SIS➣Simulation Induced Sickness (program) |
| SIS➣Sistemas Israelitas de Seguridad (Guatemala) |
| SIS➣Slovenský Internetový Spravodaj (Slovak Internet Search) |
| SIS➣Stil I Stål (Finnish: Style in Steel) |
| SIS➣Subversive Intellectual Society |
| SIS➣Solar Interplanetary Satellite |
| SIS➣Sales Implementation Specialist (Sprint) |
| SIS➣Statistical Inventory Sampling |
| SIS➣Shuttle Interface Subsystem (US NASA) |
| SIS➣Slovenská Informacná Služba (Slovak Information Service) |
| SIS➣Station Indépendante Satellite (Belgian radio) |
| SIS➣Supply Information System |
| SIS➣Saratoga Investama Sedaya (Indonesia) |
| SIS➣Special Inventory System |
| SIS➣Special Isotope Separation/Separator |
| SIS➣Serial Interface Server |
| SIS➣Standardized Interface Specification |
| SIS➣Single Image Software |
| SIS➣Sensor & Instrumentation System |
| SIS➣Scientific Information Services Limited (St. Augustine, Trinidad & Tobago) |
| SIS➣Simulator Interface Subsystem |
| SIS➣Switch Interface System |
| SIS➣Surface Instrumentation Subsystem |
| SIS➣Special Intelligence Study |
| SIS➣Secondary Items Study |
| SIS➣System Integrity Statement |
| SIS➣Sensory Index Score |
| SIS➣Server Infrastructure Strategy |
| SIS➣Ship's Information System |
| SIS➣Standard Inspection Sheet |
| SIS➣Site Information Set |
| SIS➣Shock Inertia Switch |
| SIS➣Stow Infrastructure System |
| SIS➣Status Interrupt Signal |
| SIS➣Supervisory Investigative Specialist |
sis - a female person who has the same parents as another person; "my sister married a musician"