Mass is the term used to describe celebration of the Eucharist in the Western liturgical rites of the Roman Catholic Church , Old Catholic Churches , in the Anglo-Catholic tradition of Anglicanism , and in some largely High Church Lutheran regions : in Scandinavian and Baltic countries the Lutheran Eucharistic service is also known as `` the Mass '' . Mass is the Eucharistic celebration in the Latin liturgical rites of the Roman Catholic Church . The term is used also of similar celebrations in Old Catholic Churches , in the Anglo-Catholic tradition of Anglicanism , in Western Rite Orthodox Churches , in Lutheran churches , and in a small number of High Church Methodist parishes .