Guillermo José Garlatti is an Argentine prelate of the Catholic Church was the archbishop of Bahía Blanca from 2004 to 2017.

His parents moved with him to La Plata, Argentina when he was a child, where he completed his primary and secondary education.

He obtained a degree in Theology at Universidad Católica Argentina and served as Prefect at St. Joseph Seminary.

On March 11, 2003, he was named Archbishop of the Archdiocese of Bahía Blanca, succeeding Rómulo García, taking his seat on May 10, 2004.

His received his pallium from Pope John Paul II in Saint Peter's Square on June 28, 2004.