ICAS
- Court of Arbitration for Sport
- Ilahia college of Arts and Science
- Immaculate Conception Apostolic School
- Institute for China-America Studies
- Institute of Chartered Accountants of Scotland
- International Competitions and Assessments for Schools
- International Cooperation on Airport Surveillance
- International Council of the Aeronautical Sciences
- Isolated congenital asplenia
- Temple University, Japan Campus