Coazzolo is a comune (municipality) in the Province of Asti in the Italian region Piedmont, located about 50 kilometres (31 mi) southeast of Turin and about 20 kilometres (12 mi) south of Asti. As of 31 December 2004, it had a population of 301 and an area of 4.1 square kilometres (1.6 sq mi).

Coazzolo borders the following municipalities: Castagnole delle Lanze, Castiglione Tinella, Mango, Neive, and Santo Stefano Belbo.

Demographic evolution