| Type: | Cardinal |
| Honorific Prefix: | His Eminence |
| Achille Apolloni | |
| Cardinal-Deacon of San Cesareo in Palatio | |
| Church: | Roman Catholic Church |
| Appointed: | 27 May 1889 |
| Term End: | 3 April 1893 |
| Predecessor: | Ignazio Masotti |
| Successor: | Giuseppe Antonio Ermenegildo Prisco |
| Ordination: | 20 March 1850 |
| Cardinal: | 24 May 1889 |
| Created Cardinal By: | Pope Leo XIII |
| Rank: | Cardinal-Deacon |
| Birth Name: | Achille Apolloni |
| Birth Date: | 13 May 1823 |
| Birth Place: | Anagni, Papal States |
| Death Place: | Rome, Kingdom of Italy |
| Buried: | Campo Verano |
| Parents: | Vincenzo Apolloni Luisa Giannuzzi |
| Previous Post: | Vice-Camerlengo of the Apostolic Camera (1884-92) |
Achille Apolloni (13 May 1823 – 3 April 1893) was an Italian prelate of the Catholic Church who enjoyed the career of someone from a distinguished family, working in the Roman Curia or the personal service of the pope, and promoted automatically without regard for personal merit.[1] He was made a cardinal in 1890.
Achille Apolloni was born in Anagni in the Papal States on 13 May 1823 to a noble family. Beginning in 1842, he studied at the Jesuit College for Nobles, the Collegio Romano, and the Pontifical Academy of Ecclesiastical Nobles[2] alongside "other young nobles, some of whom later rose to the top positions of the Catholic Church".[3] He received an honorary doctorate in law in 1847. He was ordained a priest on 20 March 1850.
He was appointed a canon of the chapter of St. Peter's Basilica in 1851. He filled assignments as papal delegate in Rieti from 1854 and 1858 and in Macerata from 1859 to 1860; both towns were provincial capitals of the Papal States. He became an auditor of the Sacred Roman Rota in 1867[2] and in 1868 Pope Pius IX charged him managing the delivery of charity to relieve the victims of the cholera epidemic in Albano.[4]
In 1882, Pope Leo XIII named him president of the special commission for the relations between the Holy See and civil tribunals. He was named Vice-camerlengo of the Holy Roman Church on 3 December 1884.[2]
Pope Leo made him a cardinal on 24 May 1889.[2] He received his red biretta and was assigned the deaconry of San Cesareo in Palatio on 27 May 1889.
He died of a heart attack in Rome on 3 April 1893.