| CAESAR | Candidate Aes for Analysis and Reviews 
| Others |
| CAESAR | Catalogue of Arcade Emulation Software the Absolute Reference
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| CAESAR | Center of Advanced European Studies and Research
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| CAESAR | Central Asian and European Surveillance of Antimicrobial Resistance
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| CAESAR | Civilian American and European Surface Anthropometry
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| CAESAR | Civilian American and European Surface Anthropometry Resource
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| CAESAR | Clean And Environmentally Safe Advanced Reactor
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| CAESAR | Colorado Adult Education System for Accountability and Reporting
| Others |
| CAESAR | Competition for Authenticated Encryption Security Applicability and Robustness
| Others |
| CAESAR | Conjunction Analysis and Evaluation Service Alerts and Recommendations
| Others |
| CAESAR | Contractible Arms Elevating Search And Rescue
| Others |