| Acronym | Definition |
|---|
| AEGIS | [not an acronym] US Navy phased array radar-based combat system (Aegis is the Greek word for Shield) |
| AEGIS | AIDS Education Global Information Service |
| AEGIS | Advanced Electronic Guidance and Instrumentation System |
| AEGIS | Alien Exterminating Global Intercept System (anime) |
| AEGIS | Airborne Early Warning Ground Environment Integration Segment (European System) |
| AEGIS | ATM European Group for Improvement of Scenarios |
| AEGIS | Advanced Electronic Guided Interceptor System |
| AEGIS | Antimatter Experiment: Gravity, Interferometry, Spectroscopy |
| AEGIS | Appropriate and Effective Guidance for Information Security |
| AEGIS | Assessment of Effectiveness of Geologic Isolation System |
| AEGIS | Advisory Experts Group on Inherent Safety |