| San Antonio | |
| Native Name Lang: | es |
| Settlement Type: | Locality |
| Pushpin Map: | Argentina Santa Fe Province#Argentina |
| Pushpin Map Caption: | Location of San Antonio |
| Coordinates: | -31.2111°N -61.725°W |
| Subdivision Type: | Country |
| Subdivision Name: | Argentina |
| Subdivision Type1: | Province |
| Subdivision Name1: | Santa Fe |
| Subdivision Type2: | Department |
| Subdivision Name2: | Castellanos |
| Leader Title: | Mayor |
| Leader Name: | Previotto Mauro Damián |
| Unit Pref: | Metric |
| Population Total: | 412 |
| Population As Of: | 2010 |
| Population Density Km2: | auto |
| Timezone1: | ART |
| Utc Offset1: | -3 |
| Postal Code Type: | CPA base |
| Postal Code: | S2301 |
| Area Code Type: | Dialing code |
San Antonio is a locality in Santa Fe Province in northeastern Argentina. It is located on Provincial Route 70, separated from Castellanos by a street. These two localities form the urban conurbation of San Antonio-Castellanos.
There is a discrepancy regarding the date of foundation, being situated between 1892 and 1893, for which reason the year 1894 in which the layout was approved is taken as the date of foundation. The foundation of San Antonio is due to Eduardo Saguier's desire to found a colony, for which he appointed Juan Beapuy as administrator. In 1903 the commune was established. It is estimated that the name of the locality is due to the founder's devotion to Saint Anthony of Padua.[1] It is a dairy production area.[2] In 2003, the drinking water network was inaugurated.[3] It has a sports institution.[4]