UDR may refer to:

  • Ulster Defence Regiment, a former British Army infantry regiment
  • Universal dielectric response, An emergent scaling behaviour in heterogeneous materials under alternating current
  • União Democrática Ruralista, a Brazilian right-wing association of farmers
  • Union of Democrats for the Republic, a former political party in France
  • Union of the Right for the Republic, a present political party in France
  • Union for Democracy and the Republic (Chad), a political party in Chad
  • Democratic Union for the Republic, a former political party in Italy
  • UDR, Inc., a real estate company in the United States
  • Udaipur Airport, Indian airport (IATA airport code)
  • Untethered dead reckoning, GNSS-assisted dead reckoning without external sensors
  • User-Defined Reductions in OpenMP
  • U.D.R., Brazilian comedy rock band
  • Univision Deportes Radio, a Spanish language sports radio network in the United States.
  • Unlimited Desert Racer, a traxxas RC car with the best suspension system by far.

See also

  • Udr or Uðr, one of the Nine Daughters of Ægir in Norse mythology
  • Umpire Decision Review System (UDRS)