| Abbreviation | Definition |
|---|---|
| CIRO | Certified Investor Relations Officer |
| CIS | Certificate of Immunization Status |
| CIS | Certified Incentive Specialist |
| CISA | Certified Information Systems Auditor |
| CISCE | Council for the Indian School Certificate Examinations |
| CISCE | Council of Indian School Certificate Examination |
| CISCP | Certified International Supply Chain Professional |
| CISE | Certified Information Security Expert |
| CISM | Certified Information Security Manager |
| CISMP | Certificate in Information Management Principles |
| CISO | Certified Information Security Officer |
| CISP | Certified Inside Sales Professional |
| CISP | Certified IRA Service Professional |
| CITE | Certified Incentive Travel Executive |
| CITF | Certificate in International Trade and Finance |
| CITF | Certificate in International Trade Finance |
| CITP | Certified Information Technology Professional |
| CITRMS | Certified Identity Theft Risk Management Specialists |
| CITT | Certificate in Teaching Techniques |
| CIWE | Certified International Welding Engineer |