COI

COI, CoI or Coi may refer to:

Organizations

 * Center on Organizational Innovation, a research center at Columbia University
 * Central Office of Information, a former UK Government department
 * Church of Ireland, an autonomous province of the Anglican Communion
 * College of Idaho, a university
 * Commission de l'Océan Indien, or Indian Ocean Commission

Science and technology

 * California Oregon Intertie or Path 66, an electrical power transmission system
 * Centre of inertia
 * Coefficient of Inbreeding, the probability that two alleles at a given locus are identical by descent
 * Community of inquiry, a concept describing the social quality of scientific inquiry
 * Community of interest (computer security), a computer networking technique of segregation of resources
 * Confirmed opt-in, a policy for obtaining mailing list recipients
 * Contingency Orbit Insertion, an abort mode of the Apollo spacecraft
 * Cost of illness, see Disease burden
 * Cytochrome Oxidase Subunit 1, a gene
 * Coprocessor Offload Infrastructure, a high-level software library for code and data offloading to a Xeon Phi Coprocessor

Other uses

 * Comoros, UNDP country code
 * Commission of inquiry (disambiguation)
 * Constitution of India
 * Conflict of interest
 * Certificate of insurance
 * Certificate of incorporation
 * Coi (restaurant), restaurant in San Francisco, California
 * Dennis Coi (died 1987), Canadian figure skater
 * Trịnh Cối (died 1584), Vietnamese de facto ruler of Southern dynasty
 * Coi (album), a 2023 album by Coi Leray