The SNLE 3G (Sous-Marin Nucléaire Lanceur d'Engins de Troisieme Génération "third generation nuclear ballistic missile submarine") is a class of submarines under development for the French Navy's nuclear deterrent, part of the Force de dissuasion.

It is being designed as a replacement for the current Triomphant class beginning around 2035, and could remain in service to as late as 2090.

[2] The current French ballistic missile submarines, the Triomphant class came into service from 1997 and are due to be withdrawn around 2035.

The start of the general detailed design phase for the vessels was announced on 18 February 2021 by Minister of the Armed Forces Florence Parly.

They are expected to have improved acoustic and magnetic shielding to reduce their visibility to detection systems.