Marcantonio Negri (died October 1624) was an Italian composer, singer, and musical director of the early Baroque era.
He was born in Verona, but aside from this, little is known about his life prior to his appointment as assistant maestro di cappella at St. Mark's on 22 December 1612, a position in which he supported Monteverdi as primary maestro di cappella.
His first book of affetti amorosi (1608) is in the most modern canzonetta style, using affective chromaticism and continuo.
In 1611 he published another book of affetti amorosi which includes sonatas for two violins and continuo, as well as some sinfonias.
Stylistically they conform to the typical practice of divided choirs and groups of instruments used by the other composers at St. Mark's (see Venetian polychoral style, concertato).