Matías Daniel Lammens Nuñez (born 5 April 1980) is an Argentine businessman and politician, who served as the country's Minister of Tourism and Sports from 2019 to 2023, in the cabinet of President Alberto Fernández.

[4] His business career started when he set up a kiosk in 2003; he later founded Ñuque Mapu SRL, a Buenos Aires–based company dedicated to the sale and distribution of alcoholic beverages, chiefly wine.

[6] Alongside Tinelli he formed the San Lorenzo Siglo XXI association, and upon the resignation of Carlos Abdo from the club's presidency in August 2012, he was appointed interim chairman, becoming the youngest person to hold the post at 32.

The Lammens-Tinelli leadership proved effective in reducing the club's financial woes, and the 2013 Torneo Inicial victory was hailed as a turnaround for San Lorenzo under its new directive board.

[4] In October 2014 Lammens rejected an offer by the Azerbaijani government to sponsor the club, citing Azerbaijan's poor human rights record and the occupation of Nagorno-Karabakh;[12] the move drew praise from Argentina's sizeable Armenian community.

[19] Despite the wide loss margin, Lammens's share of the votes represents the best electoral result for an opposition party in Buenos Aires City since Mauricio Macri's victory in 2007.

As part of the ministry's salvagement measures, Lammens launched an emergency investment fund, infrastructure boosts,[22] and the PreViaje programme, wherein the government committed to repaying up to 50% of all travel expenses for internal tourists in the 2020–2021 summer season.