The Cantiere Internazionale d'Arte (International Art Workshop) is an annual international summer school and musical festival for young singers, actors, musicians, conductors and composers.

It was set up in Montepulciano, Italy, in 1976 by Hans Werner Henze.

Hans Werner Henze founded the Cantiere Internazionale d'Arte in Montepulciano, Tuscany, in 1976.

Productions of concerts and theatre are prepared in the summer school and then played at the festival.

Since November 2005 the workshop has been organised by the Fondazione Cantiere Internazionale d'Arte di Montepulciano, run by the town, and by the Province of Siena.