San Martín de los Cansecos is a town and municipality in Oaxaca in south-western Mexico.

The municipality covers an area of 45.93 km².

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

As of 2015, the municipality had a total population of 851.

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