Um
- .um
- Air Zimbabwe
- Filler (linguistics)
- Micrometre
- Ultrarapid metabolizer
- Um (Korean surname)
- Um (cuneiform)
- Um interface
- Umphrey's McGee
- Unified Messaging
- Unified Model
- Union for the Mediterranean
- United Methodist Church
- United Motors Company
- United States Minor Outlying Islands
- Universal McCann
- Universal Medicine
- Unofficial magistrate
- User manual
- Utilization management
- Uttaradi Math