| Unión Department | |
| Native Name: | Departamento Unión |
| Native Name Lang: | es |
| Settlement Type: | Department |
| Mapsize: | frameless |
| Coordinates: | -32.6333°N -108°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Argentina |
| Subdivision Type1: | Province |
| Established Title: | Foundation |
| Established Date: | 16 November 1888 |
| Founder: | provincial law |
| Seat Type: | Capital |
| Seat: | Bell Ville |
| Unit Pref: | Metric |
| Area Total Km2: | 11182 |
| Population Total: | 100247 |
| Population Density Km2: | auto |
| Population Blank1 Title: | Pop. change |
| Population Blank1: | 4.08% |
| Timezone1: | ART |
| Utc Offset1: | -3 |
| Postal Code Type: | Postal code |
| Postal Code: | X2550 |
| Area Code Type: | Dialing code |
| Area Code: | 03534 |
| Blank Name Sec1: | Distances to |
| Blank Info Sec1: | |
| Blank1 Info Sec1: | 513km (319miles) |
| Blank2 Name Sec1: | Córdoba |
| Blank2 Info Sec1: | 205km (127miles) |
Unión Department is a department of Córdoba Province in Argentina.
The provincial subdivision has a population of about 100,247 inhabitants in an area of 11,182 km², and its capital city is Bell Ville, which is located around 513 km from the Capital federal.