Varenna (Comasco, Lecchese: Varena) is a comune (municipality) on Lake Como in the Province of Lecco in the Italian region of Lombardy, located about 60 kilometres (37 mi) north of Milan and about 20 kilometres (12 mi) northwest of Lecco.

Varenna was founded by local fishermen in AD 769 and was later allied with the commune of Milan.

In 1126 it was destroyed by the rival commune of Como, and later received the refugees from the Isola Comacina, who had met the same fate (1169).

The main sights are the Castello di Vezio, a small museum dedicated to Lariosaurus (a Middle Triassic sea reptile related to turtles), as well as the beautiful gardens at Villa Monastero.

Villa Monastero, in between Varenna and Fiumelatte is nowadays a museum, botanical garden and convention center.