TRD

TRD may refer to:


 * TRD (gene), encoding the T cell receptor delta locus
 * Toyota Racing Development
 * Treatment-resistant depression in psychiatry
 * Tucson Roller Derby, Arizona, US
 * Troed-y-rhiw railway station, Wales, National Rail station code
 * Trondheim Airport, Værnes, IATA airport code
 * Transition radiation detector
 * Trinidad and Tobago, ITU country code