Tenno (Tén in local dialect) is a comune (municipality) in Trentino in the northern Italian region Trentino-Alto Adige/Südtirol, located about southwest of Trento.
Tenno borders the following municipalities: Comano Terme, Fiavè, Arco, Ledro and Riva del Garda. Its neighborhood of Canale is one of I Borghi più belli d'Italia ("The most beautiful villages of Italy").
Tenno contains the waterfalls of Cascate del Varone. Tenno hosts a yearly summer festival called Quarta d'Agosto (Fourth of August) which is celebrated the fourth Sunday of August, in Cologna.