La fièvre monte à El Pao ("Fever Mounts at El Pao", also known in English as Republic of Sin) is a 1959 film by director Luis Buñuel.

On the remote Caribbean island Ojeda an agitated population kills their despotic ruler Mariano Vargas.

Meanwhile, Alejandro Gual, leader of a special military unit, tries to take the place of Ramón Vázquez.

Knowing that Ramón Vázquez had an affair with the dictator's wife Inés, he tries to turn the widow against her lover.

In 2008, La Fièvre Monte à El Pao was screened in Retrospective section of the 68th Berlin International Film Festival.