Nicholas V, born Pietro Rainalducci (c. 1258 – 16 October 1333)[1] was an antipope in Italy from 12 May 1328 to 25 July 1330 during the pontificate of Pope John XXII (1316–1334) at Avignon.

[2] He was elected through the influence of the excommunicated Holy Roman Emperor, Louis the Bavarian, by an assembly of priests and laymen, and consecrated at Old St. Peter's Basilica, Rome, on 12 May 1328 by the bishop of Venice.

On 19 February 1329, Nicholas V presided at a ceremony in the Duomo of Pisa, at which a straw puppet representing Pope John XXII and dressed in pontifical robes was formally condemned, degraded, and handed over to the secular arm (to be "executed").

Having obtained assurance of pardon, he presented a confession of his sins first to the archbishop of Pisa, and then at Avignon on 25 August 1330, to John XXII, who absolved him.

In a monumental fresco by Buonamico Buffalmacco in the Camposanto Monumentale di Pisa, Nicholas V is depicted in Hell being dismembered and eaten by demons.