| Acronym | Definition |
|---|
| IOAA➣International Olympiad on Astronomy and Astrophysics (est. 2007) |
| IOAA➣Intentions of an Arsonist (band) |
| IOAA➣Intentions of an Asteroid (band) |
| IOAA➣Institute of Actuaries of Australia |
| IOAA➣Immediate Office of the Assistant Administrator |
| IOAA➣Image of an Assassination (documentary) |