San Agustín Amatengo is a town and municipality in Oaxaca in south-western Mexico.

The municipality covers an area of 58.69 km².

It is part of the Ejutla District in the south of the Valles Centrales Region.

In 2005, the municipality had a total population of 1,455.

[1] This article about a location in the Mexican state of Oaxaca is a stub.