| San José de Jáchal | |
| Native Name Lang: | es |
| Settlement Type: | City |
| Pushpin Map: | Argentina |
| Pushpin Map Caption: | Location of San José de Jáchal in Argentina |
| Coordinates: | -30.2333°N -113°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Argentina |
| Subdivision Type1: | Province |
| Subdivision Type2: | Department |
| Subdivision Name2: | Jáchal |
| Unit Pref: | Metric |
| Population Total: | 21,018 |
| Population As Of: | 2001 census |
| Population Density Km2: | auto |
| Timezone1: | ART |
| Utc Offset1: | -3 |
| Postal Code Type: | CPA base |
| Postal Code: | J5460 |
| Area Code Type: | Dialing code |
| Area Code: | +54 2647 |
San José de Jáchal (pronounced as /es/, often shortened to Jáchal) is a city in the northeast of the province of San Juan, Argentina, located on National Route 40, south of the Jáchal River. It has 21,018 inhabitants per the, and is the head town of the Jáchal Department.
San José de Jáchal was founded on 25 June 1751 by the field master Juan de Echegaray, by the order of the Board of Populations of the Kingdom of Chile. That same month, through an interesting ceremony, the Villa de San José de Jáchal, forty leagues north of San Juan de la Frontera, was born to civilian and political life.