OO
- OO – (i) Object Oriented – Over & Out
- OOO – (i) Out Of the Office
- OOAD – (i) Object Oriented Analysis and Design
- OOBE – (a) Out-of-body experience
- OOCL – (i) Orient Overseas Container Line
- OODA – (i) Observation, Orientation, Decision, Action loop (a.k.a. Boyd's Loop)
- OOP – (i) Object-Oriented Programming – Out Of Print
- OOS – (i) Occupational Overuse Syndrome – OneSAF Objective System – Open Operating System – Out Of Service
- OOTW – (i) Operations Other Than War
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