Bertrand de L'Isle-Jourdain (1227–1286) was the bishop of Toulouse from 1270 until his death.
Bertrand was a son of Bernard Jordan, the lord of L'Isle-Jourdain, and Indie, an illegitimate daughter of Count Raymond V of Toulouse.
He was serving the cathedral as provost when Bishop Raymond du Fauga died on 19 October 1270.
[2] As bishop, he unsuccessfully defended his vassals' claim of exemption from service in the royal army.
He began a reconstruction of the cathedral in the Gothic style, devoting much of his personal wealth to the project.