| Bestertius | |
| Bishop Of: | Bishop of Csanád |
| Enthroned: | 1138 or earlier |
| Ended: | 1138/1142 |
| Predecessor: | Lawrence (?) |
| Successor: | Paul |
| Death Date: | after 1138 |
| Nationality: | Hungarian |
| Religion: | Roman Catholic |
Bestertius (Hungarian: Beszteréd; died after 1138) was a Hungarian prelate in the 12th century, who served as Bishop of Csanád around 1138.
He became bishop sometime after 1113, when his last known predecessor Lawrence is mentioned. His name appears among the testimonies in that document, in which Béla II of Hungary listed the estates and privileges of the Dömös Chapter in 1138. It is plausible that Bestertius was the bishop, when Béla II founded the Arad Chapter around 1135, exempting it from the jurisdiction of the Diocese of Csanád. Bestertius was succeeded by Paul, who is mentioned in this capacity in 1142.