Gouffre Jean-Bernard, Alpine cave system in Samoëns, France

The Gouffre Jean-Bernard is an extensive cave system carved through limestone in the French Alps. Multiple passages and chambers interconnect throughout the mountain, with entrances scattered across different elevations in the surrounding terrain.

The first entrance, V4, was found in 1963 by the Groupe Vulcain during its summer camp, and exploration stopped at −100 m. The cave is named after Jean Dupont and Bernard Raffy, two group members killed in 1963 by a flood in the Goule de Foussoubie. In July 1979 the connection of Gouffre B21 made the network the world's deepest known cave at −1,358 m, a record it held until January 1998, when Gouffre Mirolda surpassed it.

The cave is named after Jean Dupont and Bernard Raffy, two Groupe Vulcain cavers who died in 1963 during a flood in the Goule de Foussoubie. The Groupe Vulcain, which found the V4 entrance that same year, still carries out the surveys; a topographic synthesis compiled from 2013 to 2024 gives 1,612 m of depth and 29,558 m of passages.

Exploring this system requires speleology experience and specialized equipment for safe navigation. Certain sections may have restricted access depending on seasonal water levels and conditions.

The cave was named after Jean Dupont and Bernard Raffy, two Groupe Vulcain members who died in 1963 in a flood during an exploration of the Goule de Foussoubie, a separate cave. The naming honours them rather than marking the site of the accident.