St. Cecilia Mass is the common name of a solemn mass in G major by Charles Gounod, composed in 1855 and scored for three soloists, mixed choir, orchestra and organ. The official name is Messe solennelle en l’honneur de Sainte-Cécile, in homage of St. Cecilia, the patron saint of music. The work was assigned CG 56 in the catalogue of the composer's works.

The Mass is a form of sacred musical composition that sets the invariable portions of the Christian Eucharistic liturgy, known as the Mass.