| El Aioun | |
| Native Name: | العيون |
| Settlement Type: | Commune and town |
| Pushpin Map: | Mauritania |
| Pushpin Label Position: | bottom |
| Pushpin Mapsize: | 300 |
| Pushpin Map Caption: | Location in Mauritania |
| Subdivision Type: | Country |
| Subdivision Name: |  Mauritania |
| Subdivision Type1: | Region |
| Subdivision Name1: | Assaba |
| Subdivision Type2: | Department |
| Subdivision Name2: | Kankossa |
| Leader Title: | Mayor |
| Leader Name: | Bah O/ Sid’Ahmed (PRDS) |
| Population As Of: | 2013 census |
| Population Total: | 22796 |
| Population Density Km2: | auto |
| Population Metro: | 65237 |
| Population Blank1 Title: | Ethnicities |
| Timezone: | GMT |
| Utc Offset: | +0 |
| Coordinates: | 15.55°N -11.1839°W |
| Native Name Lang: | ar |
Aioun or El Aioun is a town and commune in the Assaba Region of southern Mauritania near the border with Mali.
It has a population of 22,796.[1]