Castello Tesino (German:Kastelalt or Tasein) is a comune (municipality) in Trentino in the northern Italian region Trentino-Alto Adige/Südtirol, located about 40 kilometres (25mi) east of Trento. As of 31 December 2004, it had a population of 1,443 and an area of 112.7 square kilometres (43.5sqmi).