| CIS | Commonwealth Of Independent States | - | Atmospheric Research Center |
| CIS | Chemical Information System | - | Computer Acronyms(common) |
| CIS | Commonwealth Of Independent States | - | Computer Acronyms(common) |
| CIS | Characteristic Isochromat Spectroscopy | - | Computer Acronyms(common) |
| CIS | Central Integration Site | - | Organizations |
| CIS | Change Impact Summary | - | Organizations |
| CIS | Communication Interface System | - | Organizations |
| CIS | Communications Interface System | - | Organizations |
| CIS | Component Identification Sheet | - | Organizations |
| CIS | Contractor's Information Submittal | - | Organizations |
| CIS | Canadian Interuniversity Sport - Commonwealth Of Independent States - Command And Information System - Communication And Information System | - | Astronomy |
| CIS | Center for Internet Security
| - | Human Genome |
