博肖（意大利语：Bosio），是意大利亚历山德里亚省的一个市镇。总面积66.88平方公里，人口1227人，人口密度18.3人/平方公里（2009年）。ISTAT代码为006022。

Bosio is a comune (municipality) in the Province of Alessandria in the Italian region Piedmont, located about 100 kilometres (62 mi) southeast of Turin and about 35 kilometres (22 mi) southeast of Alessandria.

Bosio borders the following municipalities: Campo Ligure, Campomorone, Casaleggio Boiro, Ceranesi, Gavi, Genoa, Lerma, Masone, Mele, Mornese, Parodi Ligure, Rossiglione, Tagliolo Monferrato, and Voltaggio.