L'Isle-Bouzon (French pronunciation: [lil buzɔ̃]; Occitan: L'Isla Boson) is a commune in the Gers department in southwestern France.

The village lies above the right bank of the Auroue, which flows north through the western part of the commune.

[3] In 2020, Météo-France published a typology of climates in mainland France in which the commune is exposed to a altered oceanic climate and is part of the Aquitaine, Gascogne climatic region, characterized by abundant rainfall in spring, moderate rainfall in autumn, low sunshine levels in spring, hot summers with 19.5 °C (67 °F), light winds, frequent fog in autumn and winter, and frequent thunderstorms in summer (15 to 20 days).

[3] For the subsequent period of 1991 to 2020, the average annual temperature observed at the nearest weather station, located in the commune of Mauroux, 7 kilometres (4 mi) away as the crow flies,[5] is 14.0 °C (57 °F), and the average annual total rainfall is 677.6 mm.

[6][7] For the future, climate parameters for the commune projected for 2050, based on different greenhouse gas emission scenarios, can be consulted on a dedicated website published by Météo-France in November 2022.