Lodovico (or Ludovico) Zacconi (11 June 1555 – 23 March 1627)[1] was an Italian composer and musical theorist of the late Renaissance and early Baroque eras.

In 1577 he was in Venice studying at the church of San Stefano, and at some point in the following six years he was accepted by Andrea Gabrieli as a student of counterpoint.

Also at this time he met Zarlino, the prominent Venetian School theorist; he was to mention the meeting in the second part of his Prattica di musica (1622).

Zacconi's fame rests on his great work Prattica di Musica, first published in 1592 at Venice, of which a second volume appeared in 1619 (or, according to other sources, 1622).

His theoretical works are conservative, and make no mention of the emerging Baroque style, in spite of his studies with the distinguished Venetian composer Andrea Gabrieli.