OAO
| Abbreviation | Meaning | Tamil Meaning | Category |
|---|---|---|---|
| OAO | Orbiting Astronomical Observatory | - | Atmospheric Research Center |
| OAO | Orthogonalized Atomic Orbital | - | Computer Acronyms(common) |
| OAO | Orbiting Astronomical Observatory | - | Scuba Diving |
| OAO | Over And Out | - | ISO Country Codes |
| OAO | Office Of Aircraft Operations | - | Business and Finance |