Other
- Ci, common of Qi (surname) from Tungusic peoples
- Customer Intelligence, a discipline in marketing
- Civilian Instructor, an adult volunteer in the British Air Cadet Organisation
- Cycling Ireland
- Competitive intelligence
- Collective intelligence, a subfield of sociology
- China Airlines
- Collegium Invisibile
- Confucius Institute
- Consumers International
- Corporate identity, a concept in marketing
- CI Records, a record label
- Comprehensible Input
- Cambria and Indiana Railroad
- Contact improvisation
- Christian Identity
- Continuous Improvement Process
- Creative Industries
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