Giovanni Nasco (also Jhan) (c. 1510 – 1561) was a Franco-Flemish composer and writer on music, mainly active in Italy. He was the first director of the Veronese Accademia Filarmonica, and his writings, particularly a group of letters he wrote to the Academy in the 1550s, are important sources of information on performance practice regarding use of instruments in madrigals as well as motets.

No documentation has yet turned up covering Nasco’s early life, but he is presumed to have come from the Netherlands or adjacent areas, the home of most of the Franco-Flemish composers. Only the portion of his life he spent in Italy has been documented. He was in the service of Paolo Naldi, a nobleman in Vicenza, in the 1540s, and in 1547 he became the music director of the newly formed Accademia Filarmonica in Verona. While this may have been a prestigious and intellectually engaging post, it paid little, and in 1551 he took a job as maestro di cappella at the cathedral of San Pietro in Treviso, with some reluctance. He retained ties with the Accademia, as well as his post at Treviso, until his death.