| Almirante Brown Department | |
| Native Name Lang: | es |
| Settlement Type: | Department |
| Mapsize: | 180px |
| Pushpin Map Caption: | Location of Almirante Brown Department in Argentina |
| Coordinates: | -26.5167°N -71°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Argentina |
| Subdivision Type1: | Province |
| Established Date: | 1937-12-07 |
| Seat Type: | Head town |
| Seat: | Pampa del Infierno |
| Unit Pref: | Metric |
| Area Total Km2: | 17,276 |
| Population Total: | 28,096 |
| Population Density Km2: | auto |
| Population Demonym: | brownense |
| Timezone1: | ART |
| Utc Offset1: | -3 |
| Postal Code: | K3708 |
| Area Code: | 03732 |
Almirante Brown Department is the westernmost department of Chaco Province in Argentina.
The provincial subdivision has a population of about 28,000 inhabitants in an area of 17,276 km2, and its capital city is Pampa del Infierno, which is located around 1,265 km from the Capital federal.
The department is named in honour of William Brown (1777 -1857), the Irish born commander in chief of the Argentine Navy.
The city of Pampa del Infierno hosts the annual Fiesta Provincial del Chivo (Provincial Goat Festival).