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UBR may refer to:

  • Unspecified bit rate, a traffic contract used to guarantee quality of service for Asynchronous Transfer Mode networks
  • Universal broadband router, an alternate name for a cable modem termination system
  • UDDI Business Registry
  • Uniform Business Rate
  • "U.B.R. (Unauthorized Biography of Rakim)", a song on the album Street's Disciple by Nas
  • Unmatched Brutality Records
  • University Boat Race