Peter Anthony Libasci (born 9 November 1951) is an American prelate of the Roman Catholic Church who has been serving as the Bishop of the Diocese of Manchester in New Hampshire since 2011. Libasci previously served as an auxiliary bishop of the Diocese of Rockville Centre in New York from 2007 to 2011. Libasci is a bi-ritual priest, allowed to celebrate the Divine Liturgy and administer the sacraments in both the Latin Church and the Ruthenian Greek Catholic Church.