Santiago Yucuyachi (monte-breve)is a town and municipality in Oaxaca in south-western Mexico.

The municipality covers an area of 90.58 km².

[1] It is part of the Silacayoapam District in the Mixteca Region.

As of 2005, the municipality had a total population of 742.

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