| Official Name: | Ain Bni Mathar |
| Settlement Type: | Town |
| Pushpin Label Position: | bottom |
| Pushpin Mapsize: | 300 |
| Subdivision Type: | Country |
| Subdivision Name: |  Morocco |
| Subdivision Name1: | Oriental |
| Subdivision Type2: | Province |
| Subdivision Name2: | Jerada |
| Unit Pref: | Imperial |
| Population As Of: | 2014 |
| Population Total: | 16289 |
| Utc Offset: | +0 |
| Timezone Dst: | WEST |
| Utc Offset Dst: | +1 |
Ain Bni Mathar (Arabic: عين بني مطهر) is a town and municipality in Jerada Province, Eastern region, Morocco. It is located 81 km south of Wejda and 36 km from the Algerian border.
At the time of the 2004 census, it had a population of 13,526.[1]
In 2011 the first Thermo Solar Combined Cycle Power Plant of Morocco was constructed near the town.