| Acronym | Definition |
|---|
| CSSO➣Contractor Special Security Officer |
| CSSO➣Chief State School Officer |
| CSSO➣Chief Student Services Officer (California community colleges) |
| CSSO➣Clotted Symmetric Sexual Organ (Japanese band) |
| CSSO➣Computer System Security Officer |
| CSSO➣Customer Service, Sales & Operations |
| CSSO➣Computer Special Security Officer |
| CSSO➣Communications-Computer Systems Security Officer |
| CSSO➣CLIC (Cancer and Leukaemia in Childhood) Sargent Symphony Orchestra (UK) |
| CSSO➣Child Safety Support Officer (Australia) |
| CSSO➣Compliance Sampling and Support Organization |
| CSSO➣Combat Service Support for Operations |
| CSSO➣Cantorial School Student Organization (Jewish Theological Seminary) |