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 FoundationScience 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 enginesSport
* 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) teamOther 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 WelshSee also
* Kai (disambiguation) * CAIS (disambiguation) {{disambiguation