TRN

TRN may refer to:
 * Taiga Rescue Network
 * Talk Radio Network, US radio syndicator
 * Terrain Relative Navigation, NASA technology used by Mars landers
 * Thalamic reticular nucleus
 * The Rail Network, an American television network
 * Times Record News, a daily newspaper in Wichita Falls, Texas
 * Turin International Airport, Italy, IATA code