OCI may refer to:

Businesses and organizations

  • OCI (company), green energy and chemical company, South Korea
  • Oakwood Collegiate Institute, Toronto, Canada
  • Office of Criminal Investigations of the U.S. Food and Drug Administration
  • Olympic Council of Ireland, former name the national olympic committee of Ireland
  • Ontario Cancer Institute, Canada
  • Order of the Crown of Italy, Italian order
  • Open Constitution Initiative, advocacy group in China
  • OCI NV, parent company of Orascom Construction
  • Ottawa Collegiate Institute, now Lisgar Collegiate Institute, Canada
  • Organisation Communiste Internationaliste, (Internationalist Communist Organisation), former French political party

Computing

  • Open Catalog Interface, an interface standard in computing
  • Open Container Initiative, a Linux standards project in computing
  • Oracle Call Interface, database interface software

Other uses

  • oci, ISO 639-2/3 language code for Occitan language
  • Organizational conflict of interest
  • Other comprehensive income
  • Overseas Citizen of India, a scheme granting a status similar to, but not the same as, dual citizenship in India