- CAOS stands for Chemical Analysis Of Samples
- CAOS stands for Computer-Assisted Orthopaedic Surgery
- CAOS stands for Chicago Academy of Sciences (Illinois; also seen as CHIAS)
- CAOS stands for Computer Architecture Operating System
- CAOS stands for Commercial Adoption of Open Source (The 451 Group service)
- CAOS stands for Center for Atmosphere Ocean Sciences (New York University, New York)
- CAOS stands for Creatures Agent/Object Scripting (Creatures gaming scripting language)
- CAOS stands for Combined Automated Operations System (US Customs and Border Protection)
CAOS