| Honorific-Prefix: | Most Reverend |
| Ilario Cortesi | |
| Bishop of Policastro | |
| Church: | Catholic Church |
| Diocese: | Diocese of Policastro |
| Term: | 1605–1608 |
| Predecessor: | Filippo Spinelli |
| Successor: | Giovanni Antonio Santorio |
| Birth Date: | 1545 |
| Birth Place: | Naples, Italy |
| Death Date: | September 1608 |
| Death Place: | Policastro, Italy |
Ilario Cortesi, C.R. (1545 – September 1608) was a Roman Catholic prelate who was Bishop of Policastro (1605–1608).
Cortesi was born in Naples, Italy, and ordained a priest in the Congregation of Clerics Regular of the Divine Providence. On 10 October 1605, he was appointed by Pope Leo XI as Bishop of Policastro. He wserved as Bishop of Policastro until his death.