1360 – 14 May 1426) was an Italian composer and organist of the late medieval and early Renaissance eras.
Mazzuoli was born in Florence and probably trained on organ by his father Niccolò, who was organist at the church of Orsanmichele until 1376.
There is a large section of the Squarcialupi Codex, an important source of early Italian music, which is marked out under his name.
However, no music is written in these pages; they are decorated around the edges but left blank otherwise.
There are at least ten of his works written on a palimpsest in an Italian manuscript, Florence, Archive of San Lorenzo, MS 2211, but the state of the parchment has until recently left them essentially unreadable.