UM or um may refer to:
Universities
- U of M (disambiguation) or UM, abbreviation for various universities
Businesses
- Air Zimbabwe (IATA code UM)
- United Motors Company, a former name of American automotive parts supplier ACDelco
- Universal McCann, a global advertising and media agency
- Universal Medicine, an Australian cult selling unproven methods of healing
Science and technology
- .um, the Top-Level Domain for United States Minor Outlying Islands
- Um interface, the air interface for the GSM mobile telephone standard
- Micrometre (μm), sometimes written as "um" in limited character sets
- Unified Model, a global numerical weather prediction model
- Ultrarapid metabolizer, a term used in pharmacogenomics to refer to individuals with substantially increased metabolic activity
- User manual, a document or manual intended to give assistance to people using a particular system
- Utilization management, the evaluation of the appropriateness, medical need and efficiency of health care
Other uses
- Um (Korean surname)
- "Um", an exclamation or filler in spoken conversation
- Um (cuneiform), a sign in cuneiform writing
- Umphrey's McGee, a jam band
- Unofficial magistrate, as a postnominal
- Unified Messaging, in marketing
- United States Minor Outlying Islands (ISO 3166 code UM)
- Union for the Mediterranean, an intergovernmental organization of 43 countries from Europe and the Mediterranean Basin
- Uttaradi Math, a Hindu matha (monastery)
- United Methodist, a religious organization
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