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Guillem Agel i Barrière was a leading Catalan printer and publisher born in Thuir, Roussillon, France (formerly North Catalonia) in 1753. He died in 1832.

During the years prior to the French Revolution, Agel i Barrière promoted the development of theater for the benefit of the Church of Thuir.

The continuity of these productions attracted the most important playwrights of Rousillon to the city (the so-called Group of Thuir). In addition, the interest of Agel i Barrière for theater led him to collect scripts that were circulating, some of which he printed, for example in the case of the Catalan translation of Racine's tragedy Esther (1792).

He also collected Catalan translations of French plays that had been translated by the members of the Group: Zaira by Voltaire, Atalia by Racine and Corneille’s Polyeucte, as well as original plays from these same authors.

Additionally, Agel i Barrière was the author of a rhetorical treatise entitled Poésies ad usum Guillelmi Barrière, which is now kept at the manuscript archives of the Department of Pyrenees-Orientales in Perpignan, France. <Diccionari de la Literatura Catalana, 2008>