Oscar Cantoni is an Italian prelate of the Catholic Church who has been Bishop of Como since 2016. He was previously Bishop of Crema from 2005 to 2016.

The Diocese of Como is a Latin Church ecclesiastical jurisdiction or diocese of the Catholic Church in northern Italy. It was established in the Fourth Century. It is a suffragan diocese in the ecclesiastical province of the metropolitan Archdiocese of Milan. The Bishop of Como's cathedra is in the Como Cathedral.