Matías Daniel Lammens Nuñez (born 5 April 1980) is an Argentine businessman and politician, currently serving as the country's Minister of Tourism and Sports since 10 December 2019, in the cabinet of President Alberto Fernández. From 2012 to 2019 he was chairman of Club Atlético San Lorenzo de Almagro, a Buenos Aires-based sports club best known for its football team, which plays in the Primera División, the first tier of the Argentine football league system, and is considered one of the "big five" of Argentine football. With Lammens at its helm, the club won its first ever Copa Libertadores.