| Official Name: | Ayoun el Atrous |
| Pushpin Map: | Mauritania |
| Pushpin Label Position: | bottom |
| Pushpin Mapsize: | 300 |
| Pushpin Map Caption: | Location in Mauritania |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Name: | Mauritania |
| Subdivision Name1: | Hodh El Gharbi |
| Area Total Km2: | 111.4 |
| Population As Of: | 2013 census |
| Population Total: | 24,199 |
| Population Urban: | 22,796 |
| Coordinates: | 16.6667°N -46°W |
| Elevation M: | 259 |
Ayoun al Atrous (also known as Aioun el Atrouss) (Arabic: عيون العتروس) is a town in southern Mauritania. It is located at around 16.6667°N -9.6167°W. It is the capital of Hodh El Gharbi region.
The city is served by the Aioun el Atrouss Airport, 40NaN0 north-west of the city. The town is located in the southern area of the Aoukar, a former lake basin.[1]
Ayoun al Atrous was one of the stops in the 2007 Dakar Rally.