| C&SI | Consulting and Systems Integration 
| Others |
| CSI | Cadet Sub Inspector
| Others |
| CSI | Cadsoft Solutions, Inc.
| Others |
| CSI | California Solar Initiative
| Others |
| CSI | California Specifications Index
| Others |
| CSI | Called Subscriber Identification
| Others |
| CSI | Camera Serial Interface
| Others |
| CSI | Campbell Scientific, Inc.
| Others |
| CSI | Can't Speak Italian
| Others |
| CSI | Can't Stand Idiots
| Others |
| CSI | Can't Stand It
| Others |
| CSI | Canadian Securities Institute
| Others |
| CSI | Canadian Softwood Inspection
| Others |
| CSI | Cape Sailing Institute
| Others |
| CSI | Capital Structure Irrelevance
| Others |
| CSI | Car Seat Installation
| Others |
| CSI | Carbon Structural Integration
| Others |
| CSI | Cardio Strength Intervals
| Others |
| CSI | Cardiological Society of India
| Others |
| CSI | Cardiovascular Systems Inc
| Others |
| CSI | Caregiver Services Inc
| Others |
| CSI | Cartwise Systems, Inc.
| Others |
| CSI | Casino, New South Wales, Australia
| Others |
| CSI | Catalysis Services International
| Others |
| CSI | Catalytic Solutions Inc.
| Others |
| CSI | Catholic Scouts of Ireland
| Others |
| CSI | Catholic Scripture Intensive
| Others |
| CSI | Cauchy Schwarz Inequality
| Others |
| CSI | Cemetery Scene Investigation
| Others |
| CSI | Center for School Improvement
| Others |
| CSI | Center for Student Involvement
| Others |
| CSI | Center for the Study of Intelligence
| Others |
| CSI | Center Station In charge
| Others |
| CSI | Central Sophomore Initiative
| Others |
| CSI | Central States Indemnity
| Others |
| CSI | Central States Industrial
| Others |
| CSI | Centre for Social Innovation
| Others |
| CSI | Certified Success Instantly
| Others |
| CSI | Certified Sucess Instantly
| Others |
| CSI | Cetacean Society International
| Others |
| CSI | Channel State Information
| Others |
| CSI | Channel Status Information
| Others |
| CSI | Charter School Institute
| Others |
| CSI | Chevrolet Spin Indonesia
| Others |
| CSI | Chi Sigma Iota
| Others |
| CSI | Child Safety Initiative
| Others |
| CSI | Child Seat Isofix
| Others |
| CSI | Child Support Interactive
| Others |
| CSI | Childbirth Survival International
| Others |
| CSI | ChildSafe International
| Others |
| CSI | Chinese System Interface
| Others |
| CSI | Christ Serving Individuals
| Others |
| CSI | Christ's Secret Investigators
| Others |
| CSI | Christian Schools International
| Others |
| CSI | Church of South India
| Others |
| CSI | Church Student Interaction
| Others |
| CSI | Cisco Safe Implementation
| Others |
| CSI | Civic Service Institute
| Others |
| CSI | Civic Si
| Others |
| CSI | Classic Slip Inversion
| Others |
| CSI | Client Side Include
| Others |
| CSI | Client Specific Instruction
| Others |
| CSI | Cliftons Songwriter Initiative
| Others |
| CSI | Clinical Scene Investigator
| Others |
| CSI | Clock Serial Interface
| Others |
| CSI | Closure System International
| Others |
| CSI | Closure Systems International
| Others |
| CSI | Clovers Scientific Intelligence
| Others |
| CSI | Club Saga Iswara
| Others |
| CSI | Club Sandwich Index
| Others |
| CSI | Club Seat Ibiza
| Others |
| CSI | Club Sport Injected
| Others |
| CSI | Club Sport Intelligent
| Others |
| CSI | Club Subaru Impreza
| Others |
| CSI | Co-elliptic Sequence Initiation
| Others |
| CSI | Coated Side In
| Others |
| CSI | Cognitive Skills Index
| Others |
| CSI | Cold Set Investigations
| Others |
| CSI | Cold Start Injector
| Others |
| CSI | Collateral Services Incorporated
| Others |
| CSI | Collect Semen Immediately
| Others |
| CSI | Collections Services Initiative
| Others |
| CSI | College of Southern Idaho
| Others |
| CSI | College of Staten Island
| Others |
| CSI | College of Stupid Idiots
| Others |
| CSI | College Scene Investigation
| Others |
| CSI | Color Solutions International
| Others |
| CSI | Colorado Structures Inc
| Others |
| CSI | Colorado Swimming Inc
| Others |
| CSI | Colorist Society International
| Others |
| CSI | Colourist Society International
| Others |
| CSI | Combat Studies Institute
| Others |
| CSI | Combat Studies Institutetute
| Others |
| CSI | Combined Summer Institute
| Others |
| CSI | Comfort Super Injection
| Others |
| CSI | Command Sequence Introducer
| Others |
| CSI | Command Stream Interpreter
| Others |
| CSI | Command String Interface
| Others |
| CSI | Commercial Systems Integrator
| Others |
| CSI | Commission Sportive Internationale
| Others |
| CSI | Committee for Skeptical Inquiry
| Others |
| CSI | Committee Of Suansation Institution
| Others |
| CSI | Commodity Selection Index
| Others |
| CSI | Commodity Systems Inc
| Others |
| CSI | Common Sense Initiative
| Others |
| CSI | Common Service Interface
| Others |
| CSI | Common Software Interface
| Others |
| CSI | Common Synchronous Interface
| Others |
| CSI | Common System Interface
| Others |
| CSI | Communications Side Information
| Others |
| CSI | Community of Scholarly Innovation
| Others |
| CSI | Community Security Initiative
| Others |
| CSI | Community Service Impact
| Others |
| CSI | Community Service Infusion
| Others |
| CSI | Community Service Initiative
| Others |
| CSI | Community Solutions Inc
| Others |
| CSI | Compact Source Iodide
| Others |
| CSI | Companion of the Star of India
| Others |
| CSI | Complex Specified Information
| Others |
| CSI | Comprehension Strategies Instruction
| Others |
| CSI | Comprehensive Support and Improvement
| Others |
| CSI | Comprehensive Swine Identification
| Others |
| CSI | Compression and Spark Ignition
| Others |
| CSI | Compression Sense Ignition
| Others |
| CSI | Compuserve Inc.
| Others |
| CSI | Computational Science Initiative
| Others |
| CSI | Computer Science Index
| Others |
| CSI | Computer Security Institute
| Others |
| CSI | Computer Security International
| Others |
| CSI | Computer Services Inc
| Others |
| CSI | Computer Society of India
| Others |
| CSI | Computer Society of Iran
| Others |
| CSI | Computers and Structures Inc
| Others |
| CSI | Concept Systems, Inc.
| Others |
| CSI | Conditional Symmetric Instability
| Others |
| CSI | Confusing Set of Initials
| Others |
| CSI | Connect Serve And Impact
| Others |
| CSI | Connectivity Services, Inc.
| Others |
| CSI | Conservation Science Initiative
| Others |
| CSI | Conservation Science Investigations
| Others |
| CSI | Consolidated Software Inventory
| Others |
| CSI | Construction Specification Implementation
| Others |
| CSI | Construction Specifications Institute
| Others |
| CSI | Consultancy Sourcing and Implementation
| Others |
| CSI | Consulting Services Inc
| Others |
| CSI | Consumer Safety Inspector
| Others |
| CSI | Consumer Survivor Initiative
| Others |
| CSI | Contact Surface Imaging
| Others |
| CSI | Container Security Initiative
| Others |
| CSI | Container Storage Interface
| Others |
| CSI | Content Saturation Index
| Others |
| CSI | Continual Service Improvement
| Others |
| CSI | Continuous School Improvement
| Others |
| CSI | Contractors Society Insti
| Others |
| CSI | Control Sequence Indicator
| Others |
| CSI | Control Sequence Introducer
| Others |
| CSI | Control Sequence Introduction
| Others |
| CSI | Control Servo Input
| Others |
| CSI | Controlled Science Incorporated
| Others |
| CSI | Controls Southeast Inc
| Others |
| CSI | Controls-Structures Interaction
| Others |
| CSI | Convergence Sublayer Indication
| Others |
| CSI | Cookies Sound Interesting
| Others |
| CSI | Cool Science Investigations
| Others |
| CSI | Cooperative Services International
| Others |
| CSI | Corel Script Include
| Others |
| CSI | Corn Still Investigation
| Others |
| CSI | Corporate Social Investment
| Others |
| CSI | Corporate Spending Innovations
| Others |
| CSI | Corpus Salesianum Italian
| Others |
| CSI | Corriente Sindical de Izquierdas
| Others |
| CSI | Corvettes of Southeast Idaho
| Others |
| CSI | Cosmetic Surgery Incorporated
| Others |
| CSI | Counter Strike Incorporated
| Others |
| CSI | Coupe Sport Injected
| Others |
| CSI | Coupe Sport Injection
| Others |
| CSI | CPU Support Identification
| Others |
| CSI | Cracklin Skin Investigators
| Others |
| CSI | Crash Scene Investigation
| Others |
| CSI | Crash Scene Investigator
| Others |
| CSI | Creative Skills for Innovation
| Others |
| CSI | Creative Solutions Inc
| Others |
| CSI | Crime Scene Investigation
| Others |
| CSI | Crime Scene Investigations
| Others |
| CSI | Crime Scene Investigator
| Others |
| CSI | Crime Scene Investigators
| Others |
| CSI | Crime Stoppers International
| Others |
| CSI | Criminal Science Investigation
| Others |
| CSI | Criminal Science Investigator
| Others |
| CSI | Criminally Stupid Individual
| Others |
| CSI | Critical Safety Item
| Others |
| CSI | Critical Satellite Image
| Others |
| CSI | Critical Solutions International
| Others |
| CSI | Critical Sustainability Item
| Others |
| CSI | Cruel Sadistic Idiot
| Others |
| CSI | Cultivating Significance and Influence
| Others |
| CSI | Current Source Inverter
| Others |
| CSI | Current Swing Index
| Others |
| CSI | Curriculum Solutions Investigations
| Others |
| CSI | Custom Satisfaction Information
| Others |
| CSI | Custom Software Interface
| Others |
| CSI | Custom Staffing Inc
| Others |
| CSI | Customer Satisfaction Index
| Others |
| CSI | Customer Satisfaction Indexing
| Others |
| CSI | Customer Service Index
| Others |
| CSI | Customer Service Innovation
| Others |
| CSI | Customer Supplies Income
| Others |
| CSI | Customer Support ID
| Others |
| CSI | Customer Support Identifier
| Others |
| CSI | Cyber Security Index
| Others |
| CSI | Cyber Security Indonesia
| Others |
| CSI | Cyber Security Innovations
| Others |
| CSI | Cyber Security Institute
| Others |
| CSI | Cyber Security Intelligence
| Others |
| CSI | Cyber Security International
| Others |
| CSI | Cybersecurity Skills Index
| Others |
| CSI | Cybersecurity Summer Institute
| Others |