In All The Tropes' ongoing quest for Continual Service Improvement, we have created this disambiguation page for CSI.
- CSI: Crime Scene Investigation and its spin-offs
- Consorzio Suonatori Indipendenti, an Italian punk/art band
- Church of Scientology International
- Cigar Store Indian
- "Civilian Saucer Intelligence" and "Committee for Skeptical Inquiry", two Real Life groups on opposite sides of the Flying Saucer question