| Acronym | Definition |
|---|
| MOO | Mode of Operation |
| MOO | Master of Orion (computer game) |
| MOO | Multi-Objective Optimization (engineering) |
| MOO | My Opinion Only |
| MOO | MUD Object Oriented |
| MOO | Multi Objective Optimizer |
| MOO | Microsoft Office Outlook |
| MOO | Matter of Opinion |
| MOO | Mutual of Omaha (insurance company) |
| MOO | Market on Open (investing/trading) |
| MOO | Memorandum Opinion and Order (FCC) |
| MOO | Multiuser Object-Oriented |
| MOO | Marathon Infinity (computer game; oo represents infinity symbol) |
| MOO | Mothers Opposed to the Occult |
| MOO | Mutuality of Obligation (legal concept) |
| MOO | Measure Of Outcome |
| MOO | Material on Order |
| MOO | MPLS (Multi-Protocol Label Switching) Over OTN (Optical Transport Network) |
| MOO | Maintenance Operations Officer (US Air Force) |
| MOO | Market of Opportunities (software) |