TRF may refer to: Medicine and Science Terminal restriction fragments, used in measuring telomere length Thyrotropin-releasing factor, a peptide hormone secreted by the hypothalamus Time-restricted feeding, a type of intermittent fasting Transfer RNA-derived fragment TERF1, Telomeric repeat-binding factor 1 (also known as TRF1) Places Sandefjord Airport, Torp, Norway, IATA code Thief River Falls, Minnesota, USA Organisations Tactical recognition flash, UK armed forces Texas Renaissance Festival, USA Thoroughbred Retirement Foundation, racehorse rescue organization TRF (band), a J-pop group Regional Federal Courts (Portuguese: ), Brazilian Federal appellate courts Other Tuned radio frequency receiver, a type of radio Trinidadian Creole, by ISO 639 code TRF1, French howitzer