Magdalena Tlacotepec is a town and municipality in Oaxaca in south-western Mexico.

The municipality covers an area of 234.75 km2.

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

In 2005, the municipality had a total population of 1,165.

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