You can´t talk about scuba diving inFrance without mentioning Saint-Tropez. The once small fishing village is now one of the world´s top destinations for sun, sea and diving. Both for party-goers and family vacations, the warm, dry and sunny weather here is unmatched which makes it a great place to dive in.
The southern coastline is full of diving centers but not all of them will be able to speak English, so make sure you do a little research before buying your tickets. Nearby towns like Hyere, Nice and Marseille are also hotspots for watersports and are only 1 or 2 hours away by train/plane so make sure you do a little tour instead of staying in one place.
You should definitely visit the Graillon Marine Park, the Donator wreck, The Rubis wreck, The Togo, the Liban, a French steamship, amongst other dive sites in the Bay of St. Tropez.