Um

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