| Avellaneda Department | |
| Native Name Lang: | es |
| Settlement Type: | Department |
| Mapsize: | 180px |
| Pushpin Map Caption: | Location of Avellaneda Department within Santiago del Estero Province |
| Coordinates: | -28.4814°N -63.0692°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Argentina |
| Subdivision Type1: | Province |
| Subdivision Name1: | Santiago del Estero |
| Seat Type: | Head town |
| Seat: | Herrera |
| Unit Pref: | Metric |
| Area Total Km2: | 3902 |
| Population Total: | 20763 |
| Population As Of: | 2010 |
| Population Density Km2: | auto |
| Timezone1: | ART |
| Utc Offset1: | -3 |
Avellaneda Department (Spanish; Castilian: Departamento Avellaneda) is a department of Argentina in Santiago del Estero Province. The capital city of the department is situated in Herrera.