Vix pervenit is an encyclical, promulgated by Pope Benedict XIV on November 1, 1745, which condemned the practice of charging interest on loans as usury. Because the encyclical was addressed to the bishops of Italy, it is generally not considered ex cathedra. The Holy Office applied the encyclical to the whole of the Roman Catholic Church on July 29, 1836, during the reign of Pope Gregory XVI.

Pope Benedict XIV, born Prospero Lorenzo Lambertini, was head of the Catholic Church and ruler of the Papal States from 17 August 1740 to his death in May 1758.