Guillermo Cabanellas de Torres (Melilla, 25 June 1911–Buenos Aires, 13 April 1983) was a Spanish historian, labor lawyer, publisher, and lexicographer who carried out his work in Spain, Paraguay, and Argentina.

At the time of his birth in Melilla, his father, Cavalry Commander Miguel Cabanellas Ferrer, was organizing the first Indigenous Regular Forces in Spanish Morocco.

He took part in the failed Jaca uprising against Dámaso Berenguer's dictatorship and in the people's movements that led to the proclamation of the Second Spanish Republic on 14 April 1931.

Two days later, when a part of the army rose up in arms against the Republican Government, he was in Zaragoza where his father, General Cabanellas Ferrer, joined the movement and seized power in that city.

As he felt that his life was in danger, Cabanellas de Torres fled with Carmen to France at the beginning of May 1937 and from there they traveled to Montevideo, Uruguay, where they lived for six months.

Thus, in this treatise, Cabanellas did not limit himself to Argentine law but also included the comparative legislation of Latin American countries, which is one of the reasons why this work is so widespread and influential in the region.

Another one of his works that is frequently cited is the Diccionario enciclopédico de derecho usual (Encyclopedic Dictionary of Common Law), the twenty-fifth edition of which was published in 2003.

In Argentina, he resumed his friendship with republican personalities such as Leandro Pita Romero and Niceto Alcalá Zamora, the first president of the Second Spanish Republic.

Perhaps for this reason he insisted on the importance of the administrative and judicial bodies responsible for the application of laws in the region, since if they were not effective due to corruption or lack of means, it would be useless to enact legislation that would broadly protect the rights of workers.