KTS/Kts may refer to: Keirsey Temperament Sorter, a self-assessed personality questionnaire Key telephone system Klippel–Trénaunay syndrome in medicine Knight of the Military Order of the Tower and Sword of Portugal The Knights Templar School, a secondary school in Baldock, Hertfordshire, England Knot (unit), a unit of speed equal to one nautical mile per hour Brevig Mission Airport (IATA: KTS) Potassium thiosulfate Københavns Tekniske Skole, a school of secondary education in Copenhagen, Denmark Kagoshima Television, a Japanese commercial TV station