| Acronym | Definition |
|---|
| ENI | École Nationale des Impôts (French: National Tax School) |
| ENI | European Neighbourhood Instrument (EU) |
| ENI | Extreme Networks, Inc. (Santa Clara, CA) |
| ENI | Ente Nazionale Idrocarburi (Italy) |
| ENI | Enable Interrupt |
| ENI | Efficient Networks Interface |
| ENI | Entire Net Income (finance) |
| ENI | Ending Net Investment (finance) |
| ENI | Ecole Nationale d'Ingénieurs (French: National Engineer School) |
| ENI | École Normale d'Instituteurs (French: Normal School of Teachers; various locations) |
| ENI | Electrical North Incorporated (Fort Wayne, IN) |
| ENI | Employee Network Inc. |
| ENI | Electronic Navigation Industries |
| ENI | Entertainment Network, Incorporated |
| ENI | Enteroviral-Nutritional Interaction (etiology of beta-islet cell damage in diabetes) |
| ENI | Embedded Networking Interface |