Niccolò Fieschi (c. 1456 – 1524) was an Italian Cardinal, of a prominent family of Genoa which features in Verdi's Simon Boccanegra.
He was bishop of Fréjus from 1485, and bishop of Agde from 1488. He was archbishop of Ravenna from 1516.
Nuccolo Fieschi can't be the Fieschi Verdi mantions in his Opera "Simon Boccanegra" since the Opera takes place in the middle of the 14th century and Niccolo lived in the 15th century.