| Official Name: | San Cayetano |
| Pushpin Map: | Argentina |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location in Argentina |
| Pushpin Mapsize: | 200 |
| Pushpin Mapsize1: | 200 |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Buenos Aires |
| Subdivision Type2: | Partido |
| Subdivision Name2: | San Cayetano |
| Established Title: | Founded |
| Established Date: | 13 March 1911 |
| Population Total: | 8,399 |
| Coordinates: | -38.3467°N -59.6094°W |
| Elevation M: | 98 |
| Postal Code Type: | CPA Base |
| Postal Code: | B 7521 |
| Area Code: | +54 2983 |
San Cayetano is a small town of about 8,000 people in Buenos Aires Province, Argentina.[1] It is the administrative center for San Cayetano Partido. The settlement was established on 13 March 1911 by provincial law.
The population of the municipality of San Cayetano decreased from 8,687 in 2001 to 8,399 in 2010, while the population of the town increased 9% from the 2001 census of 6,757 to 7,354 in 2010.
In 1903, Victorio de la Canal, whose estancia was named "San Cayetano" after San Cayetano, a Catholic Saint (1480-1547), donated land for a British-owned railway company to build a railroad through the area. On 14 February 1907, the San Cayetano station opened. Pedro Nolasco Carrera, a local landowner with considerable political influence, requested permission to found a town near the railway station on his own land, for which official authorization was received from the provincial governor, Inocencio Arias, on 13 March 1911. Six days later, on 19 March, auctioneer Ramon Tristany conducted the first public auction of lots, both residential and agricultural. The partido, of which it is now a part, was not created until 1958.[2]