| Acronym | Definition |
|---|
| CISO➣Chief Information Security Officer |
| CISO➣California Independent System Operator |
| CISO➣Counterintelligence Support Officer (US DoD) |
| CISO➣Corporate Information Security Officer (corporate position) |
| CISO➣Counterintelligence Staff Officer (US DoD) |
| CISO➣Canadian International Security Organization (Captain Canuck comic fictional spy organization) |
| CISO➣Centro de Investigacion y Solidaridad Obrera (Spanish: Research Center and Working Solidarity; Mexico) |
| CISO➣Counterintelligence Security Officer |
| CISO➣Curriculum Instructions & Standards Office |
| CISO➣Commercial Imagery Staff Office |