Cai or CAI may refer to:
Places
- Cai (state), a state in ancient China
 - Caí River, Rio Grande do Sul, Brazil
 - Cái River, Vietnam
 - Cairo International Airport (IATA airport code)
 - Caithness, a historic county in Scotland (Chapman code)
 
Organisations
- Canadian Airlines International, a defunct Canadian airline
 - Capitol Archaeological Institute, an American archaeological research and education institute part of The George Washington University
 - Central Asia Institute, a non-profit organization that promotes education in Central Asia
 - Chartered Accountants Ireland, Ireland's largest accountancy body
 - Christian Assemblies International, an Australian-based charity organisation and religious group
 - Club Alpino Italiano, the Italian alpine club
 - Coleraine Academical Institution, a school in Northern Ireland
 - College of Anaesthesiologists of Ireland, a medical training body in Ireland
 - Community Associations Institute, an influential trade association and special interest group
 - Compagnia Aerea Italiana, parent company of Alitalia
 - Corendon Airlines (ICAO airline code)
 - Corpo Aereo Italiano, an element of the Italian Regia Aeronautica during the Battle of Britain
 - WCAI, a group of NPR radio stations in Massachusetts that is part of the WGBH Educational Foundation
 
Science and technology
- Calcium–aluminium-rich inclusion, a type of mineral
 - Carbonic anhydrase inhibitor, in pharmacology
 - Codon Adaptation Index, a measure of codon bias in protein-coding DNA sequences
 - Cold air intake, of an automobile
 - Computer-aided inspection
 - Computer assisted instruction or e-Learning
 - Computer-assisted language learning
 - Conodont Alteration Index, an estimate of the maximum temperature reached by a sedimentary rock
 - Controlled Auto-Ignition, a technology of internal combustion for reciprocating engines
 
Sport
- Club Atletico Independiente de La Chorrera, a Panamanian football (soccer) team
 - Comisión de Actividades Infantiles, an Argentine football (soccer) team
 - Club Atlético Independiente, an Argentine football (soccer) team
 
Other uses
- Cai (name), Welsh and alternative spelling of the name Kai.
 - Cai (surname), a common Chinese surname
 - Comprehensive Agreement on Investment, a proposed deal between China and the European Union
 - Mesoamerican languages (ISO 639-2 and ISO 639-5 codes)
 - Sir Kay, a character in Arthurian legend, spelt Cai in Welsh
 
See also
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