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UID may refer to:

  • Unique Identification Number later renamed as Aadhaar number, an initiative of Unique Identification Authority of India of the Indian government to create a unique ID for every Indian resident.
  • UID = VAT identification number (in German language) (VAT: Value added tax)
  • Ulster Institute for the Deaf
  • Umeå Institute of Design
  • Unitedworld Institute of Design, college in India
  • Universal Instructional Design, an educational method that tries to deliver teaching to meet the needs of wide variety of learners.
  • Unintelligent Design, a satirical reaction to the Intelligent Design movement
  • Unique identifier
  • PubMed 'Unique Identifier' parameter designating specific scientific publication abstracts; see: PMID
  • 'Unique Item Identifier', a specific value in the Item Unique Identification system used by the United States Department of Defense for the identification of accountable equipment according to DoD Instruction 5000.64
  • A nonprofit organization in Tokyo, Japan responsible for the Ucode system for uniquely identifying real-world objects electronically
  • Unidentified decedent, a deceased person whose body has not yet been identified.