| Luján | |
| Native Name: | Partido de Luján |
| Settlement Type: | Department |
| Coordinates: | -34.5667°N -65°W |
| Subdivision Type: | Country |
| Subdivision Name: | Argentina |
| Established Title: | Established |
| Established Date: | 1731 |
| Seat Type: | Seat |
| Seat: | Luján |
| Leader Party: | FDT |
| Leader Title: | Mayor |
| Leader Name: | Leonardo Boto |
| Unit Pref: | Metric |
| Area Total Km2: | 800 |
| Population Total: | 93992 |
| Population Density Km2: | auto |
| Population Demonym: | lujanense |
| Postal Code Type: | Postal Code |
| Postal Code: | B6700 |
| Postal2 Code Type: | IFAM |
| Postal2 Code: | BUE075 |
| Area Code Type: | Area Code |
| Area Code: | 02323 |
| Blank Name Sec1: | Patron saint |
| Blank Info Sec1: | Nuestra Señora de Luján |
Luján Partido is a partido in the northeastern part of Buenos Aires Province in Argentina.
The provincial subdivision has a population of about 94,000 inhabitants in an area of 8000NaN0, and its capital city is Luján, which is 670NaN0 from Buenos Aires.
The economy of Luján Partido is dominated by farming, other aspects include textile and medical manufacturing, and the production of agrochemicals and agricultural machinery.