Ambrosian chant (also known as
Milanese chant) is the liturgical
plainchant repertory of the
Ambrosian rite of the Roman Catholic Church, related to but distinct from
Gregorian chant. It is primarily associated with the Archdiocese of Milan, and named after St.
Ambrose much as Gregorian chant is named after
Gregory the Great. It is the only surviving plainchant tradition besides the Gregorian to maintain the official sanction of the Roman Catholic Church.