| Mutatesia Leonelli | |
| Death Date: | 1662 |
| Occupation: | Lawyer, Poet |
| Treasurer of the Pontifical Chambers – (Appointed by Pope Urban VIII) | |
| Father: | Giulio Leonelli |
| Mother: | Virginia Leonelli née Fornari |
| Family: | Innocenzo Leonelli, Ignatius of Jesus – (born Carlo Leonelli), and three sisters |
Mutatesia Leonelli (died 1662) was a lawyer and later appointed Treasurer Pontifical Chambers by Pope Urban VIII. He was also a poet, publishing three works throughout his lifetime. With the exception of a short period of financial hardship which resulted in a brief excommunication, he led a successful life at the Papal Court. He was the older brother of Innocenzo Leonelli and the Discalced Carmelite missionary Ignatius of Jesus.