Terlago was a comune located in the Trentino province of the northern Italian region of Trentino-Alto Adige/Südtirol. It was situated approximately 6 kilometres (4 mi) northwest of the city of Trento.
As of December 31, 2004, the municipality covered an area of 37.0 square kilometres (14.3 mi2) and had a population of 1,571 residents. On January 1, 2016, Terlago was merged with the neighboring municipalities of Padergnone and Vezzano to form the new municipality of Vallelaghi.