Domenico Mazzocchi (baptised 1592 in Civita Castellana – 21 January 1665 in Veja)[a] was an Italian Baroque composer of only vocal music, of the generation after Claudio Monteverdi.
He is associated with providing music for the popes, particularly Cardinal Maffeo Barberini, later Pope Urban VIII, until Mazzocchi's death in Rome on 21 January 1665.
His younger brother, Virgilio Mazzocchi, was a less notable Roman composer and had a similar career as a Vatican music provider.
Madrigali a 5 voci in partitura (1638), madrigals which have Basso continuo, similar to the late Monteverdi; these contain the first notations, as explained in the preface, of the persisting conventional musical symbols < 'crescendo', > 'decrescendo', p(iano), f(orte) and tr(illo)