UIN may refer to:

Common

  • User Identification Number, used by many computer security systems and ICQ, see ICQ#UIN, Unique identifier and User (computing)
  • Universal Identification Number
  • used for people, see National identification number and Unique Identification Authority of India, see also Permanent account number (PAN)
  • used for inventory, see also UID
  • University Identification Number, used by many universities for students, faculty and alumni
  • Unit Identification Number, used by the military, see Military unit
  • Unit Identification Number, used by the Department of Education, see Integrated Postsecondary Education Data System
  • Unique Identification Number, similar to Universal Identification Number used for people and inventory, see above, and often replaced by Universally unique identifier (UUID)

Other uses

  • User Intelligent Network, a type of network artificial intelligence, see, for example Personal communications network
  • Airport code for Quincy Regional Airport in Illinois, United States