Angelo di Costanzo (c. 1507 – November 1591), Italian historian and poet, was born at Naples around 1507.

His great work, Le Istorie del regno di Napoli dal 1250 fino al 1498, first appeared at Naples in 1572, and was the fruit of thirty or forty years labour; but nine more years were devoted to the task before it was issued in its final form at Aquila (1581).

In conversation with his friends they joined in regretting the want of any trustworthy history of Naples, and lamented the inaccuracy of Pandolfo Collenuccio.

He began his history with the death of Frederick II and continued it till the beginning of the barons' war against Ferdinand I of Naples in 1486.

[4] His flamboyant style was reminiscent of earlier, more extravagant fifteenth-century poets such as Panfilio Sasso and Antonio Tebaldeo.