| Ancasti | |
| Native Name: | Departamento Ancasti |
| Settlement Type: | Department |
| Coordinates: | -28.8125°N -65.5008°W |
| Subdivision Type: | Country |
| Subdivision Name: | Argentina |
| Established Title: | Established |
| Established Date: | ? |
| Founder: | ? |
| Seat Type: | Seat |
| Seat: | Ancasti |
| Leader Title: | Mayor |
| Leader Name: | Blanca Azucena Reina, FCS |
| Unit Pref: | Metric |
| Area Total Km2: | 2,413 |
| Population Total: | 3,082 |
| Population Density Km2: | auto |
| Population Demonym: | ancastiense |
| Postal Code Type: | Postal Code |
| Postal Code: | K4701 |
| Postal2 Code Type: | IFAM |
| Postal2 Code: | CAT002 |
| Area Code Type: | Area Code |
| Area Code: | 03832 |
| Blank Name Sec1: | Patron saint |
| Blank Info Sec1: | ? |
Ancasti is a department located in the southern part of Catamarca Province in Argentina.
The provincial subdivision has a population of about 4,000 inhabitants in an area of, and its capital city is Ancasti, which is located around from the Capital federal.