Pietro Pileo di Prata (c.1330–1400) was an Italian bishop and cardinal. He was a significant diplomat and go-between in the affairs of his times, and was nicknamed the "cardinal with three hats", which he obtained successively from Urban VI, Clement VII, and Boniface IX.

The Diocese of Treviso is Latin Church ecclesiastical territory or diocese of the Catholic Church in the Veneto, Italy. It is a suffragan diocese in the ecclesiastical province of the metropolitan Patriarchate of Venice.