Erba (previously Erba-Incino, as it formed by the union of these two places, together with some smaller districts) is a comune (municipality) of some 17,000 inhabitants in the Province of Como in the Italian region Lombardy. It is located 40 kilometres (25 mi) north of Milan and about 10 kilometres (6 mi) east of Como in the traditional region of Brianza at the foot of the Lombard Prealps and close to Monte Bollettone.
Erba was the site of the slaughter of four people including a 2 year old baby in December 2006. A married couple (the victims neighbours) have been arrested for the murders, the district attorney of Como believes that the reason for the killings is related to an ongoing feud between the families. It received the honorary title of city with a presidential decree on May 12, 1970.