Pedro Tenorio (c. 1328 – 18/28 May 1399), sometimes called Pedro Díaz de Tenorio, was the bishop of Coimbra from 1371 to 1377 and archbishop of Toledo from 1377 until his death. Pedro was educated in exile in France and Italy. He fought in the Castilian Civil War in 1367 and obtained a doctorate in canon law in 1368. In the Western Schism, he argued the conciliarist position. He played a leading role in the regency of Henry III in 1391–1393. He is remembered primarily as an administrator and builder whose legacy is bridges, towns, churches, hospitals and castles. According to the Diccionario biográfico español, he was "one of the great archbishops of Toledo".

Pedro was the son of Diego Alfonso Tenorio, whose ancestors came from Pontevedra, and Juana Duque of Talavera de la Reina. He was born around 1328 either in Toledo or in Talavera. He had two brothers, Juan and Mendo. His first recorded ecclesiastical office was the archdeaconry of Toro, where he successfully sued his predecessor, Diego Arias Maldonado, for mismanaging the benefice.

When King Peter the Cruel came to power, Pedro and his brothers fled to France with a large quantity of silver and gold. The archdeaconry was taken from him and bestowed on a son of Mateos Ferrández de Cáceres, a close associate of the king. A canonry in Toledo was offered him, but he could not take it up. Juan died in papal Avignon, while Mendo was lured back with a false safeconduct and murdered on the king's orders. These deaths left Pedro sole heir to a vast fortune.

On 6–7 January 1364, Pope Urban V granted Pedro a canonry at Coimbra on the condition that he give up the archdeaconry of Toro and his other benefices in the diocese of Zamora to Pedro Fernández. That same year, Pedro obtained a baccalaureate in canon law from the University of Toulouse. He then served for a time as a rector of the University of Perugia, where he studied under Baldo degli Ubaldi.

By December 1364, Pedro had taken up a chair at the University of Rome with a salary of 200 florins per annum. On 1 December, Pope Urban granted him a canonry and prebend at Lisbon Cathedral. At the renewed outbreak of civil war in Castile, he left to join the army of Count Henry of Trastámara. He had left Rome by August 1366, when he asked to exchange his canonry in Coimbra for one that had just opened up in Seville.

According to Pedro López de Ayala, Pedro Tenorio fought on horseback and was captured in the Battle of Nájera on 3 April 1367. Through the intercession of the Black Prince and Cardinal Guy of Boulogne, his life was spared and he was ransomed. He afterwards spent some time in Portugal in the house of Aires Gomes da Silva. He returned to Avignon later that year.

Pedro followed Urban and the curia back to Rome in 1367. He received his doctorate in 1368 in Rome. In 1370, he followed the curia back to Avignon. He was ordained a priest and given the archdeaconry of Calatrava.

On 19 May 1371, Pedro succeeded Vasco Fernández de Toledo as bishop of Coimbra. He was consecrated in Avignon by Guy of Boulogne, in whose household he had served. He visited his diocese in Portugal, but spent little time there. He was probably present at the Cortes in Lisbon on 8 August 1371. In 1372, his vicar was Fernão Gil and in 1373–1374 it was Giral Pires. He helped in the negotiations for the marriage of Beatrice of Portugal.