Marc Vincent Trudeau (born May 20, 1957) is an American priest of the Catholic Church and serves as one of the auxiliary bishops for the Archdiocese of Los Angeles, beginning in 2018, under Archbishop Jose Horacio Gomez.
Until his appointment as Auxiliary Bishop, he had been serving first in 2013 as a Vicar Forane for the Archdiocese (overseeing a territorial or ministerial division of the Archdiocese), and then in 2014 was appointed Rector of Saint John's Seminary, the archdiocesan seminary, in Camarillo, California, a suburb of Los Angeles.