Alfonso Gesualdo di Conza (20 October 1540–14 February 1603) was an Italian Cardinal, from 1561. He was from Naples. His attendance at the papal conclave of 1565-6 at the age of only 25 makes him one of the youngest Cardinals ever to participate in a papal election.
- Miranda, Salvator. 1998. "Consistory of February 26, 1561 (II)"
- Marcia B. Hall, Rome (2005), p. 303.