KTS/Kts may refer to:
- Keirsey Temperament Sorter
- Key telephone system
- Klippel-Trenaunay-Weber syndrome
- Knight of the Order of the Tower and Sword of Portugal
- 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)