| Acronym | Definition |
|---|
| OOP | Out of Print |
| OOP | Object Oriented Programming |
| OOP | Out Of Pocket (expense) |
| OOP | Order of Protection (law; various locations) |
| OOP | Out-of-Policy |
| OOP | Office of the Premier (various locations) |
| OOP | Out of Pouch (sugar gliders) |
| OOP | Out of Place |
| OOP | Out of Process |
| OOP | Order of the Phoenix |
| OOP | Out-Of-Process |
| OOP | Order of Play (sports) |
| OOP | Out of Position |
| OOP | Object Oriented Principles |
| OOP | Ordinary Object Pointer (Java) |
| OOP | Over Optimization Penalty (search engine optimization) |
| OOP | Out of Production |
| OOP | Out of Power (Dark Age of Camelot online game) |
| OOP | Out Of Play |
| OOP | Out of Picture (greyhound racing, 30+ lengths behind the winning greyhound) |
| OOP | Out of Plaster (cast) |
| OOP | Out of Protection (gaming) |
| OOP | Out of Program |
| OOP | Out of Plant |
| OOP | Out of Plumb (carpentry and construction) |
| OOP | Object Oriented Politics |
| OOP | Order Origination Point |