| C&IS | Cyber and Information Security 
| Others |
| CI(S) | Confidence Interval(S)
| Others |
| CIS | A Coordinating Instructional Staff
| Others |
| CIS | A Country Of Independent Societies
| Others |
| CIS | Cabin Interphone System
| Others |
| CIS | Cabrini Immigrant Services
| Others |
| CIS | Cairngorm Information System
| Others |
| CIS | Campaign Information System
| Others |
| CIS | Campionato Italiano Superturismo
| Others |
| CIS | Campus International School
| Others |
| CIS | Can It Sam
| Others |
| CIS | Canadian Interuniversity Sport
| Others |
| CIS | Cancer Information Service
| Others |
| CIS | Candian Interuniversity Sport
| Others |
| CIS | Canton Island Airport
| Others |
| CIS | Capital Investment Strategy
| Others |
| CIS | Car Immobilizer System
| Others |
| CIS | Car Information System
| Others |
| CIS | Carbonlite Ionet Suspension
| Others |
| CIS | Carcinoma in Situ
| Others |
| CIS | Carcinoma-In-Situ
| Others |
| CIS | Card Information Services
| Others |
| CIS | Card Information Structure
| Others |
| CIS | Care Information System
| Others |
| CIS | Career Information System
| Others |
| CIS | Cargo Information Service
| Others |
| CIS | Case Information Study
| Others |
| CIS | Case Integration Services
| Others |
| CIS | Casualty Information Society
| Others |
| CIS | Catastrophic Incident Supplement
| Others |
| CIS | Catheter-Induced Spasm
| Others |
| CIS | Center for Imaging Science
| Others |
| CIS | Center for Immigration Studies
| Others |
| CIS | Center for Industrial Services
| Others |
| CIS | Center For Integrated Systems
| Others |
| CIS | Center for Integrative Studies
| Others |
| CIS | Center for Internet and Society
| Others |
| CIS | Center for Internet Security
| Others |
| CIS | Center of Interchange and Solidarity
| Others |
| CIS | Central Independent States
| Others |
| CIS | Central Index System
| Others |
| CIS | Central Inhibitory State
| Others |
| CIS | Central Integration Site
| Others |
| CIS | Central Intelligence Services
| Others |
| CIS | Central Issue System
| Others |
| CIS | Centre for Independent Studies
| Others |
| CIS | Centre for Intergroup Studies
| Others |
| CIS | Centre for Internet Security
| Internet, Organization, NGO, Security |
| CIS | Centro de Intercambio y Solidaridad
| Others |
| CIS | Certified Incentive Specialist
| Others |
| CIS | Certified Instrument Specialist
| Others |
| CIS | Certified IPC (Institute of Printed Circuits) Specialist
| Others |
| CIS | Certified IPC Specialist
| Others |
| CIS | Change Impact Summary
| Others |
| CIS | Character Information Sheet
| Others |
| CIS | Chartered Institute of Stockbrokers
| Others |
| CIS | Chase Information Systems
| Others |
| CIS | Cheated In Silverware
| Others |
| CIS | Checklist Individual Strength
| Others |
| CIS | Chemical Information System
| Others |
| CIS | Chemical Information Systems, Inc.
| Others |
| CIS | Chemical Inventory System
| Others |
| CIS | Children's Integrated Services
| Others |
| CIS | China Instrument and Control Society
| Others |
| CIS | Chinese International School
| Others |
| CIS | Chinese International Shipping
| Others |
| CIS | Christians In Science
| Others |
| CIS | Chromosome Information System
| Others |
| CIS | Chromosome Insertion Sequence
| Others |
| CIS | Church in Society
| Others |
| CIS | Cisgender
| Others |
| CIS | cisplatin
| Others |
| CIS | Cities In Schools
| Others |
| CIS | Citizen Information Service
| Others |
| CIS | Citizenship and Immigration Services
| Others |
| CIS | Citizenship Immigration Services
| Others |
| CIS | Citrix Insight Services
| Others |
| CIS | Clark International Speedway
| Others |
| CIS | Classic Infotainment System
| Others |
| CIS | Client Information System
| Others |
| CIS | Clinical Immunology Society
| Others |
| CIS | Clinical Information System
| Others |
| CIS | Clinically Isolated Syndrome
| Others |
| CIS | Clutch Interlock Switch
| Others |
| CIS | Co-operative Insurance Society
| Others |
| CIS | Cockpit Instrumentation System
| Others |
| CIS | Collaborations in Internet Security
| Others |
| CIS | Collaborative Information System
| Others |
| CIS | College in the Schools
| Others |
| CIS | Colombo International School
| Others |
| CIS | Colonial Intelligence Service
| Others |
| CIS | Com Internet Services
| Others |
| CIS | Combat Identification System
| Others |
| CIS | Combat In School
| Others |
| CIS | Command Information System
| Others |
| CIS | Commemorative Integrity Statement
| Others |
| CIS | Commercial Instruction Set
| Others |
| CIS | Commercial Insurance Services
| Others |
| CIS | Commercial Internet Service
| Others |
| CIS | Commercial Internet System
| Others |
| CIS | Commission on Independent Schools
| Others |
| CIS | Committee for Internal Security
| Others |
| CIS | Common Information System
| Others |
| CIS | Common Internet Services
| Others |
| CIS | Common Item Support
| Others |
| CIS | Commonwealth Of Independant States
| Others |
| CIS | Commonwealth of Independent States
| Others |
| CIS | Communicating In Spanish
| Others |
| CIS | Communication and Information Systems
| Others |
| CIS | Communication Information Systems
| Others |
| CIS | Communication Interface System
| Others |
| CIS | Communications Interface Shelter
| Others |
| CIS | Communities in Schools
| Others |
| CIS | Communities In the Schools
| Others |
| CIS | Community Information System
| Others |
| CIS | Community Innovation Surveys
| Others |
| CIS | Community Investment Strategy
| Others |
| CIS | Compass Information System
| Others |
| CIS | Compliance Implementation Services
| Others |
| CIS | Component Identification Sheet
| Others |
| CIS | Component Information System
| Others |
| CIS | Composite Information Server
| Others |
| CIS | Comprehensive Income Statement
| Others |
| CIS | Compressed Image Similar
| Others |
| CIS | Compressor Inlet Sensor
| Others |
| CIS | Compuserve Information Service
| Others |
| CIS | Computational Intelligence and Security
| Others |
| CIS | Computational Intelligence Society
| Others |
| CIS | Computer and Information Science
| Others |
| CIS | Computer and Information Systems
| Others |
| CIS | Computer Information Science
| Others |
| CIS | Computer Information Services
| Others |
| CIS | Computer Information System
| Others |
| CIS | Computer Information Systems
| Others |
| CIS | Computer Informations Systems
| Others |
| CIS | Computer Integrated Services
| Others |
| CIS | Computer Integrated Surgery
| Others |
| CIS | Computer Interface Station
| Others |
| CIS | Computer Internet Server
| Others |
| CIS | Computer Internet System
| Others |
| CIS | Computerised Information System
| Others |
| CIS | Computerized Information System
| Others |
| CIS | Computing and Information Science
| Others |
| CIS | Confederacy of Independent Systems
| Others |
| CIS | Confederation of Independent States
| Others |
| CIS | Confederation of Independent Systems
| Others |
| CIS | Configuration Interaction Single
| Others |
| CIs | Configuration Items
| Others |
| CIS | Conflict Intervention Service
| Others |
| CIS | Constant Idle Speed
| Others |
| CIS | Constant Idle System
| Others |
| CIS | Constant Injection System
| Others |
| CIS | Construction Industry Scheme
| Others |
| CIS | Consumer Information Statement
| Others |
| CIS | Contact Image Sensing
| Others |
| CIS | Contact Image Sensor
| Others |
| CIS | Content Identification System
| Others |
| CIS | Content Immutable Storage
| Others |
| CIS | Context Information Store
| Others |
| CIS | Continuous Injection System
| Others |
| CIS | Continuous Ink System
| Others |
| CIS | Continuous Inking Some
| Others |
| CIS | Continuous Interleaved Sampling
| Others |
| CIS | Contractor's Information Submittal
| Others |
| CIS | Contrast Interior Scheme
| Others |
| CIS | Conversion Indexing Sorting
| Others |
| CIS | Cooperative Information Systems
| Others |
| CIS | Cooperative Interstate Shipment
| Others |
| CIS | Copenhagen International School
| Others |
| CIS | Copper Indium diSelenide
| Others |
| CIS | Coronary Intervention Study
| Others |
| CIS | Corporate Identity System
| Others |
| CIS | Corporate Individual Scheme
| Others |
| CIS | Corporate Information System
| Others |
| CIS | Corpus Inscriptionum Semiticarum
| Others |
| CIS | Corpus Inscriptionum Swissnet
| Others |
| CIS | Corruption is Systemic
| Others |
| CIS | Cosine I Sine
| Others |
| CIS | Council of International Schools
| Others |
| CIS | Counterterrorism Intelligence Service
| Others |
| CIS | Court Information System
| Others |
| CIS | Crash Injury Study
| Others |
| CIS | Credentialing Information System
| Others |
| CIS | Credit Information System
| Others |
| CIS | Crew Information Systems
| Others |
| CIS | Criminal Information System
| Others |
| CIS | Criminal Investigation Section
| Others |
| CIS | Criminal Investigative Service
| Others |
| CIS | Criminally Insane Snipers
| Others |
| CIS | Critical Information Shortfall
| Others |
| CIS | Cruising In Style
| Others |
| CIS | Crusade Information Sheets
| Others |
| CIS | Cuba Independent Schools
| Others |
| CIS | Culligan Information Systems
| Others |
| CIS | Curb Idle Speed
| Others |
| CIS | Current Index to Statistics
| Others |
| CIS | Customer Information System
| Others |
| CIS | Customer Interaction Software
| Others |
| CIS | Customer Intercept Service
| Others |
| CIS | Customs Information System
| Others |
| CIS | Cut It Short
| Others |
| CIs | Cyber Infrastructure
| Others |
| CIS | Cybersecurity Intelligence System
| Others |
| CIS | Cynical Information System
| Others |
| CIS | Cytokine Inducible Stke
| Others |
| CIS | Cytokine-Inducing Substance
| Others |