Rezzoaglio (Ligurian: Rezzoagi, locally Rosagni) is a comune (municipality) in the Metropolitan City of Genoa in the Italian region Liguria.

Rezzoaglio borders the following municipalities: Borzonasca, Favale di Malvaro, Ferriere, Fontanigorda, Lorsica, Montebruno, Orero, Ottone, Rovegno, San Colombano Certénoli, Santo Stefano d'Aveto.

Rezzoaglio is located about 40 kilometres (25 mi) northeast of Genoa in the Aveto Valley near the Aveto torrent.

Rezzoaglio is part of the Aveto Natural Regional Park.

This Liguria location article is a stub.