Cairo Montenotte (Ligurian: Coiri) is a comune (municipality) in the Province of Savona in Liguria, an Italian region located 50 kilometres (31 mi) west of Genoa and 20 kilometres (12 mi) northwest of Savona. Located in Val Bormida, it is a member of the Comunità Montana Alta Val Bormida. It is considered to be the main centre of Val Bormida and it has 12691 inhabitants. It is the fourth municipality in the province together with Savona, Albenga and Varazze, as well as the most popular municipality in Liguria among those without outlet on the sea. The municipal area is the biggest in the province behind Sassello, and the fifth in Liguria.
In 2007, Cairo Montenotte drew up a project of collaboration with other municipalities of Val Bormida through the formulation of the so-called ‘Piano Strategico delle Città delle Bormide’, focusing on establishing the area within the Ligurian socio-economic context in a more effective way.