聖馬科斯省
Ayutla () is a municipality in the San Marcos Department of Guatemala. It is situated along the Suchiate River natural border with Mexico in the southern part of the department. The municipality center is Ciudad Tecún Umán. There is a combined road and rail bridge known as "Puente Rodolfo Robles" linking Ayutla to Ciudad Hidalgo in Chiapas, Mexico.