The Temple of Santo Stefano della Vittoria (in Italian, Tempio di Santa Maria alla Vittoria) is a small chapel-church located in Pozzo della Chiana, a small hamlet near Foiano della Chiana in the province of Arezzo. The octagonal domed structure looms over the plain of Scannagallo, and was commissioned by Cosimo I de Medici to commemorate his victory in 1554 over the forces of Siena.