Rezzo () is a comune (municipality) in the Province of Imperia in the Italian region Liguria, located about southwest of Genoa and about northwest of Imperia.
As of 31 December 2004, Rezzo had a population of 390 and an area of .
Rezzo borders the following municipalities: Aurigo, Borgomaro, Carpasio, Molini di Triora, Montegrosso Pian Latte, Pieve di Teco, and Pornassio.
In 1928 the Fascist regime, bent on creating wider Comuni, unified Rezzo with two smaller neighbouring townships, Cenova and Lavina, thus unifying at administrative level the valley of the Giara di Rezzo.