UDR

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 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.