Guillermo Baltazar Chong Díaz is a Chilean geologist and professor at the Catholic University of the North at Antofagasta, Chile. In 2018 he was named distinguished son (Spanish: hijo ilustre) of Arica.^[1] The mineral chongite is named after him.^[2]

In 2011, together with Zulma Brandoni de Gasparini and others, Chong Díaz discovered a well-preserved fossilized skull of the family Metriorhynchidae.^[3][4] The team determined it to be a specimen of Metriorhynchus westermanni, an extinct marine crocodyliform.^[4]