Um or UM may refer to:

Businesses and organisations

  • Air Zimbabwe (IATA:<code>UM</code>)
  • Union for the Mediterranean, an intergovernmental body
  • United Methodist Church
  • United Motors Company, an American automotive parts supplier
  • Universal McCann, a global advertising and media agency
  • Universal Medicine, an Australian cult

Language

  • "Um", a filler in spoken English and some other languages
  • Um (cuneiform), a prehistoric alphabetic symbol

Science and technology

  • Micrometre (μm), sometimes written as "um" in limited character sets
  • Ultrarapid metabolizer, a term used in pharmacogenomics to refer to individuals with substantially increased metabolic activity
  • .um, the Internet domain for the US Minor Outlying Islands
  • Um interface, the air interface for the GSM mobile telephone standard
  • Unified Model, a global numerical weather prediction model
  • 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)
  • Umphrey's McGee, a jam band, stylized as UM
  • Unified Messaging, in marketing
  • United States Minor Outlying Islands (ISO 3166:<code>UM</code>)
  • Unofficial magistrate, as a postnominal
  • Uttaradi Math, a Hindu matha (monastery)