OAO, a three letter acronym, may stand for:
- Orbiting Astronomical Observatory, the name of four NASA scientific satellites
- the Ontario Association of Orthodontists
- Open Stock Society (in Russian, (Открытое Aкционерное Oбщество). Compare to "Inc." or "LLP" in the United States
- The Odds Are One
- Over and Out
This disambiguation page lists articles associated with the title OAO.
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