Abstract: This special issue of the Journal of Iberian Geology (JIG) is dedicated to the ongoing geochemical research in Mexico.The idea to publish a collection of papers on the Geochemistry in Mexico was conceived in 2010 during the organization of XX Congreso Nacional de Geoquímica, Temixco, Morelos, Mexico, when the editors-in-chief and, through them, the editorial committee of the JIG were requested to evaluate the proposal of a monograph on this subject.Later, the project of publishing a collection of papers on this general theme was kindly approved by the authorities of the JIG as a special issue of this journal.It would be difficult to synthesise the wide subject of the historical developments of Geochemistry in Mexico, but we will briefly comment on the highlights of these developments since the Instituto Nacional de Geoquímica (a scientific association) commenced its work in 1990, in Cuernavaca, Morelos, Mexico.Although the initiation of the geochemical research in Mexico dates back to several decades, special impulse to this field was received when a new scientific organisation "Instituto Nacional de Geoquímica, Asociación Civil" (INAGEQ) was founded by Surendra P. Verma as its (first) President, David J. Terrell as its (first) Secretary, Juan Manuel Barbarín-Castillo as its (first) Treasurer, María Aurora Armienta-Hernández as its First Vocal, and Georgina Izquierdo-Montalvo as its Second Vocal.