Luka Mesec (born 1 July 1987) is a Slovenian politician and activist who has been the leader of the eco-socialist The Left party since June 2017.

He is the coordinator of the Council of the Initiative for Democratic Socialism, Labour-Punk University, and its successor, the Institute for Labour Studies.

Since 2010, he has participated in the work of the "Labour-Punk University," an activist organization that introduced democratic socialism to Slovenian politics, and the Institute for Labor Studies.

[4] Mesec advocates participatory economics, social corporate governance, tax relief for the poor, labor rights and the abolition of tax havens, and is against neoliberalism, which, in his opinion, is nothing more than a class struggle of capital against organized labor.

He believes that Europe, which once had a strong social democracy and trade unions, is experiencing this class struggle under the guise of European integration, in which countries compete against each other instead of being based on reciprocity.