San Blas Atempa is a town and municipality in Oaxaca in south-western Mexico.

The municipality covers an area of 148 square kilometres (57 sq mi).

It is part of the Tehuantepec District in the west of the Istmo Region.

As of 2005, the municipality had a total population of 16,899.

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