兰佐（意大利语：Ranzo），是意大利因佩里亚省的一个市镇。总面积11.73平方公里，人口565人，人口密度48.2人/平方公里（2009年）。ISTAT代码为008048。

Ranzo is a comune (municipality) in the Province of Imperia in the Italian region Liguria, located about 80 kilometres (50 mi) southwest of Genoa and about 20 kilometres (12 mi) north of Imperia. As of 31 December 2004, it had a population of 546 and an area of 11.7 square kilometres (4.5 sq mi).