Antonio Grassi (13 November 1592 – 13 December 1671), born Vincenzo Grassi, was an Italian Roman Catholic priest and a professed member of the Oratorians. Grassi was known for his humble and pious nature with a strong devotion to the Marian devotions of Loreto to where he made pilgrimages on an annual basis. Grassi was seen in Fermo as a famous confessor and a counselor who often served as a mediator between warring factions. But among the Oratorians he was known for his strong devotion to the Rule of Saint Philip Neri.Pope Leo XIII celebrated his beatification on 30 September 1900.