奥科斯是危地马拉的城镇，位于该国西南部，由圣马科斯省负责管辖，始建于1884年8月16日，面积205平方公里，2002年人口29,257，人口密度每平方公里142.72人。

Ocós is a municipality in the San Marcos department of Guatemala. It is situated on the Pacific Ocean coast, very close to the border with Mexico at 4 m altitude and two big rivers: the Suchiate and the Naranjo rivers. On 23 January 2014 it lost about 2/3 of its territory when La Blanca was named the thirtieth San Marcos Department municipality.