Guglielmo da Villanova di Francia or di Franchi, O. Min. (Latin: Guilelmus de Villanova) (French: Guillaume de Villeneuve) was a Roman Catholic prelate who served as Bishop of Trieste (1327–1330), Bishop of Sagone (1323–1327), and as an auxiliary bishop of Khanbalik.^[1]

Villeneuve was most likely from Villeneuve-les-Avignon.^[2]

On 23 July 1307,^[2] he was named by Pope Clement V along with six other Franciscan bishops (Andrew of Perugia, Andreuccio d'Assisi, Gerardo Albuini, Nicola da Banzia, Ulrico von Seyfriedsdorf, and Peregrino da Castello)^[3] to travel to China to consecrate John of Montecorvino as Archbishop of Khanbalik.^[2] He was consecrated in the same year by Niccolò Alberti, Cardinal-Bishop of Ostia.^[4] He was unable to leave with the others and on 1 May 1308, Pope Clement V, instead ordered him to leave for Tartaria sine dilatione qualibet (without any delay).^[2]

Although in January 1318, he appeared at the court of the Pope in Avignon (alongside Girolamo Catalano, former auxiliary bishop of Khanbalik and the first Bishop of Caffa, a Genoese colony in Crimea) using the title Episcopus apud Tartaros or "Bishop at Tartary" or "Bishop among Tartars", he remained a suffragan bishop of Montecorvino and did not hold an episcopal jurisdiction.^[2] It is uncertain whether he actually travelled to China where Montecorvino was resident or was assigned a geographic area of responsibility with it being most likely that he worked as a missionary bishop traveling throughout the regions occupied by the Mongols.^[2]

On 28 Feb 1323, he was appointed by Pope John XXII as Bishop of Sagone.^[2] In 1324, he travelled with papal legate Bertrand du Pouget during the Papal Army's intervention in Lombardy.^[2]

On September 25, 1327, he was transferred to the diocese of Trieste.^[2] He died in Trieste in 1330.^[2]