Vesperae solennes de Dominica, K. 321, is a sacred work composed in 1779 by Wolfgang Amadeus Mozart. It is scored for SATB soloists, SATB choir, violin I, violin II, 2 trumpets, 3 trombones colla parte, 2 timpani, and basso continuo (bassoon and organ). It was composed in Salzburg at the request of the Archbishop Colloredo for liturgical use in the city's cathedral. The title "de Dominica" signifies its use in Sunday services. In 1780, Mozart composed another setting of the Vespers, the Vesperae solennes de confessore, which shares many musical similarities with this work.