| Type: | Bishop |
| Honorific-Prefix: | Most Reverend |
| César Argelli | |
| Archbishop of Avignon | |
| Church: | Catholic Church |
| Archdiocese: | Archdiocese of Avignon |
| Term: | 1647–1648 |
| Predecessor: | Bernard Pinelli |
| Successor: | Didier Dominique Marini |
| Consecration: | 12 May 1647 |
| Consecrated By: | Federico Sforza |
| Birth Date: | 1574 |
| Birth Place: | Bologna, Italy |
| Death Date: | 30 Jul 1648 (age 74) |
César Argelli (1574–1648) was a Roman Catholic prelate who served as Archbishop of Avignon (1647–1648).
César Argelli was born in 1574 in Bologna, Italy.On 6 May 1647, he was appointed during the papacy of Pope Innocent X as Archbishop of Avignon.On 12 May 1647, he was consecrated bishop by Federico Sforza, Cardinal-Deacon of Santi Vito, Modesto e Crescenzia, with Ranuccio Scotti Douglas, Bishop of Borgo San Donnino, and Alessandro Vittrici, Bishop of Alatri, serving as co-consecrators.He served as Archbishop of Avignon until his death on 30 Jul 1648.
While bishop, he was the principal co-consecrator of Hyacinthe Serroni, Bishop of Orange (1647).