| Acronym | Definition |
|---|
| CSI | Crime Scene Investigator |
| CSI | CompuServe, Inc. |
| CSI | Crime Scene Investigation (CBS TV show) |
| CSI | Construction Specifications Institute |
| CSI | Channel State Information |
| CSI | California Solar Initiative |
| CSI | College of Staten Island (City University of New York) |
| CSI | Commodity Systems, Inc. |
| CSI | Commodity Systems Inc. (Boca Raton, FL) |
| CSI | Christian Schools International |
| CSI | Computer Security Institute |
| CSI | Chi Sigma Iota |
| CSI | Container Security Initiative (US Customs Service) |
| CSI | Container Security Initiative (US Department of Homeland Security) |
| CSI | Centro Sportivo Italiano (Italian Sports Centre) |
| CSI | Customer Satisfaction Index |
| CSI | Computer Society of India |
| CSI | Continual Service Improvement (ITIL) |
| CSI | Christian Solidarity International |
| CSI | Cité des Sciences et de l'Industrie (French: City of Sciences and Industry) |
| CSI | Combat Studies Institute |
| CSI | Creative Specialties International |
| CSI | Center for the Study of Intelligence (US CIA) |
| CSI | Civil Society Institute (Newton Centre, Massachusetts) |
| CSI | Church of Scientology International (Los Angeles, CA, USA) |
| CSI | Computer Services Inc. |
| CSI | Confederación Sindical Internacional (Spanish) |
| CSI | Can't Say It |
| CSI | Church of South India |
| CSI | Code Sequence Identification (Lavasoft) |
| CSI | Chemical Shift Imaging (multi-voxel spectroscopy method used in magnetic resonance spectroscopy) |
| CSI | Customer Service Index |
| CSI | Canadian Securities Institute |
| CSI | Coalition of Service Industries |
| CSI | Campbell Scientific, Inc. (Logan, Utah, USA) |
| CSI | Cetacean Society International |
| CSI | Common Sense Initiative |
| CSI | Center for Social Inclusion |
| CSI | Consejo Superior de Investigaciones (Spanish) |
| CSI | Criticare Systems, Inc (Waukesha, WI) |
| CSI | Common System Interface (Intel processor interconnect standard) |
| CSI | Center for Social Innovation (US and Canada) |
| CSI | Current Source Inverter (type of variable speed controller for AC motors) |
| CSI | Case-Shiller Index (real estate industry) |
| CSI | Crime Stoppers International |
| CSI | Computer Systems Integration |
| CSI | Consorzio Suonatori Indipendenti (Italian alternative music band) |
| CSI | Critical Safety Item |
| CSI | Center for School Improvement |
| CSI | Coral Sea Islands |
| CSI | Computers and Structures, Inc. |
| CSI | Consumer Safety Inspector |
| CSI | Customer Support Identifier (Oracle) |
| CSI | Chemical Shift Index |
| CSI | Civil Society International |
| CSI | Canadian Society for Immunology |
| CSI | California Steel Industries, Inc. |
| CSI | Can't Spell It |
| CSI | Conditional Symmetric Instability |
| CSI | Critical Success Index |
| CSI | Cardiological Society of India |
| CSI | Commercial Satellite Imagery |
| CSI | Called Subscriber Identification (ITU-T Rec T30) |
| CSI | Carrefour de Solidarité Internationale (French: Crossroads of International Solidarity; Canada) |
| CSI | Cast Stone Institute (Winder, GA) |
| CSI | Caregiver Strain Index |
| CSI | Centre de Santé Intégré (French) |
| CSI | Charter Schools Institute |
| CSI | Computers & Structures, Inc. |
| CSI | Computers & Structures, Inc |
| CSI | Crash Scene Investigation |
| CSI | Courtroom Sciences, Inc. |
| CSI | Collision Safety Institute |
| CSI | Colegio San Ignacio (Spanish) |
| CSI | Concours de Saut International |
| CSI | Customer Service Issue |
| CSI | Cold Start Injector (automotive) |
| CSi | Corinthian Schools, Inc. |
| CSI | Claim Status Inquiry (Medicare billing tool) |
| CSI | ChildSafe International |
| CSI | Compressor Systems, Inc. (Midland, Texas) |
| CSI | Chhatrapati Shivaji International Airport (Mumbai, India) |
| CSI | Concept Systems, Inc. |
| CSI | Child Symptom Inventory (medicine) |
| CSI | Corporate Strategies, Inc. |
| CSI | Computer Standards and Interfaces (journal) |
| CSI | Command Sequence Introducer (VT100 terminal code sequence equal to ESC) |
| CSI | Canadian Sugar Institute |
| CSI | Czech Standards Institute (Czech Republic) |
| CSI | Communication Sciences Institute |
| CSI | Conference Systems, Inc. |
| CSI | Compliance Sampling Inspection |
| CSI | Customer Service Inquiry |
| CSI | Creative Sensor Inc. (Taiwan) |
| CSI | Centro Sistemi Informativi (Swiss governmental IT center) |
| CSI | Creation Studies Institute (Fort Lauderdale, FL; est. 1988) |
| CSI | CAMEL Subscription Information |
| CSI | Certified Satellite Installer |
| CSI | Cytoplasmic Sperm Injection |
| CSI | Combat System Integration |
| CSI | Corporate Strategies International (Atlanta, GA) |
| CSI | Codeset Independence |
| CSI | Consultant and Systems Integrator (Novell) |
| CSI | Contrast Source-Inversion |
| CSI | Community of Independent States |
| CSI | Client Server Interface |
| CSI | Compact Source Iodide |
| CSI | Corporate Social Involvement |
| CSI | Chicago Systemic Initiative |
| CSI | Controls/Structures Interaction |
| CSI | Componenti e Sistemi per Impianti (Associazione; Italian) |
| CSI | Can't Stand Idiots |
| CSI | Crowbar Swinging Idiots |
| CSI | Customer Support Identification |
| CSI | Convergence Sublayer Indicator |
| CSI | Computer & Structures, Inc. (Berkeley, California) |
| CSI | CPU Support Identification (Oracle Support Services) |
| CSI | Command String Interpreter |
| CSI | Canadian Society of Immigration |
| CSI | Cougaar Software, Inc. |
| CSI | Centre for Sociology of Innovation |
| CSI | Coastal and Small Islands |
| CSI | Chemical Substances Inventory |
| CSI | Computer Supported Instruction |
| CSI | Causal Side Information |
| CSI | Carrier Scale Internetworking |
| CSI | Child Support Intervention (private child support enforcement agency) |
| CSI | Chicago Sculpture International |
| CSI | critical sustainability item (US DoD) |
| CSI | Cyber Semiotic Institute |
| CSI | Compton Scatter Imaging |
| CSI | Combined Stress Index |
| CSI | Commercial SATCOM Interconnectivity (Sprint) |
| CSI | Crazy Space Incest (Firefly TV series) |
| CSI | Corporate Social Initiative |
| CSI | Consensual Sexual Intercourse |
| CSI | Casino Service Industry (New Jersey Casino Control Commission) |
| CSI | Customer Satisfaction Indicator |
| CSI | Centric Software, Inc. |
| CSI | Core Systems, Inc. |
| CSI | Cell Sequence Integrity (ATM) |
| CSI | Crew Software Interface (NASA) |
| CSI | Collision Specialists Inc (USA) |
| CSI | Common Software Interface |
| CSI | Companion of the Star of India |
| CSI | Contractor Source Inspection |
| CSI | Commercial Satellite Interconnectivity |
| CSI | Clean Sites, Inc. |
| CSI | Coelliptic Sequence Initiation |
| CSI | Control Servo Input |
| CSI | Customer Service Indicator |
| CSI | Creative Strategies International |
| CSI | Cyclic Steam Injection (oil drilling) |
| CSI | Cleveland Scientific Institution (UK) |
| CSI | Continuous Supplier Involvement |
| CSI | Contractor Simulator Instruction |
| CSI | Canada Steamship Inspection |
| CSI | Crop System Interface |
| CSI | Controls Structures Interactions (NASA) |
| CSI | Computer Systems Installation |
| CSI | Combat System Interface (program, AMSEC) |
| CSI | Clearing Subnetwork Identification (Bellcore) |
| CSI | Clutter Suppression Interferometry |
| CSI | Competitive Strategies Initiative |
| CSI | Contract Simulator Instructor |
| CSI | Counter Strike Investigations, Inc. |
| CSI | Computer Security Instructions (AT&T) |
| CSI | Communications Solutions Incorporated |
| CSI | California Security Institute |
| CSI | Control and Sensor Integration |
| CSI | Commercial Systems Integrator (IBM) |
| CSI | Configuration Status Item |
| CSI | CONUS Sustaining Increment |
| CSI | Cuban Studies Institute |
| CSI | Contract Source Inspection |
| CSI | Customer and Subscriber Integrator |
| CSI | Constant Scan Impedance |
| CSI | Consolidated Software Index |
| CSI | Chemical Surety Inspection |
| CSI | California Skin Institute (Mountain View, CA) |
| CSI | Computer Security and Investigation |
| CSI | Costlink Systems Inc |
| CSI | Crystal Structure Imaging |
| CSI | Command Special Interest |
| CSI | Classified Salary Index |
| CSI | Corporación Siderúrgica Integral, SA |
| CSI | CyberScope Investigations LTD |
| CSI | Communications, Services and Infrastructure (industry) |
| CSI | Corporate Strategy Institute (Orlando, FL) |
| CSI | Career Sports International |
| CSI | Consumers Software Incorporated |
| CSI | Communications-Computer Systems Integration |
| CSI | Cat Smack International |
| CSI | Common Shared Infrastructure |
| CSI | Coating Specialists and Inspection Services, Inc. |
| CSI | Customer Sensitive Information (data security) |
| CSI | Campus Specialization Initiative |
| CSI | City Seats Initiative (UK) |
| CSI | Contaminant Source Inventory (various organizations) |
| CSI | Customer Support International (various locations) |
| CSI | Consumers Socially Integrated (Iowa) |
| CSI | Credit Suisse International (various locations) |
| CSI | Cigar Store Indian (advertisement figure) |
| CSI | Confédération Syndicale Internationale (French: International Trade Union Confederation) |
| CSI | Catalytic Solutions, Inc. (various locations) |
| CSI | Cryptologie et Sécurité Informatique (French: Cryptology and Information Security) |
| CSI | Customer Services International |
| CSI | Curriculum and Social Inquiry (university program) |
| CSI | Consumer Sentiment Index |
| CSI | Client Server Infrastructure (computing) |
| CSI | Committee for Skeptical Inquiry (Amherst, NY) |
| CSI | Construction Services, Inc. (various locations) |
| CSI | Critter Scene Investigation |
| CSI | Conditional Sentence of Imprisonment (Canada) |
| CSI | Conseils et Services Immobiliers (French: Consulting and Real Estate Services) |
| CSI | Customer Service Improvement (various organizations) |
| CSI | Centre Social Intercommunal (French: Intercommunal Social Center) |
| CSI | Caspian Services, Inc. (various organizations) |
| CSI | Congregation Shearith Israel (Dallas, TX) |
| CSI | Chipset Software Installation (Intel) |
| CSI | Composites pour le Sanitaire et l'Industrie (French: Composites for Health and Industry) |
| CSI | Customer Satisfaction Initiative |
| CSI | Conversion Service International, Inc. |
| CSI | Computer Solutions, Inc. (various locations) |
| CSI | Coronary Stent Implantation (cardiology) |
| CSI | Cholesterol Saturation Index |
| CSI | Curry Sales, Inc. (Minneapolis, MN; est. 1981) |
| CSI | Cité Scolaire Internationale de Lyon (French school; Lyon, France) |