Bernard de Castanet (c. 1240 – 14 August 1317) was a French lawyer, judge, diplomat, bishop and cardinal of the Roman Catholic Church.

Castanet was not a Dominican, though he had an excellent relationship with the order of the Preachers and occasionally exercised the office of inquisition as a bishop of Albi and a representative of the inquisitor of Carcassonne.

[2] In February 1267 he was a nuntius of the Pope, and had an appointment as Canon in the Cathedral Chapter of Orléans; during a legation in Lombardy he was ordered to find a suitable person to be Abbot of the monastery of S. Thomas at Cremona.

[5] He was also sent to King James of Aragon, to compose matters in the struggle between the Bishop of Maguelonne and the law faculty of Montpellier over the right to grant licentiates.

[6] In 1268, while he was papal legate in the Rhineland, he necessarily became involved in the case of Archbishop-elect Henry, who had been accused before Pope Urban IV of simony, sacrilege, perjury, homicide, and other various crimes, and was named Administrator of the Diocese of Trier.

[7] On 9 December 1272, Pope Gregory X named Bernard de Castenet Archdeacon of Majorca, with a prebend and the office of Provost of the Cathedral Chapter of Gerona.

[22] On 25 December, Jacques de Casalibus, who held the Provostship of the Cathedral Chapter of Albi, was granted the enjoyment of the income of his benefices for a period of five years.