| Acronym | Definition |
|---|
| UMO➣Unknown Mortal Orchestra (band) |
| UMO➣University of Mount Olive (North Carolina) |
| UMO➣Used Motor Oil |
| UMO➣University of Missouri |
| UMO➣University of Maine at Orono (obsolete; now University of Maine, UM) |
| UMO➣Unit Movement Officer |
| UMO➣Update.mozilla.org (website) |
| UMO➣Universal Message Object (MuleSource, Inc.) |
| UMO➣Unit Movement Office |
| UMO➣Undeliverable Mail Office (Canada Post) |
| UMO➣Unmodified Molecular Orbital |
| UMO➣Unconventional Military Operations |
| UMO➣Useless Management Overhead |
| UMO➣Unidentified Micro-particle Object (anime) |