The
340mm/45 Modèle 1912 gun (13.4") was a heavy
naval gun of the
French Navy. While the calibres of the naval guns of the French Navy were usually very close to those of their British counterparts,
[a] the calibre of 340 mm is specific to the French Navy.
The
built-up gun was designed to be carried by the
Normandie and
Lyon classes in quadruple gun turrets, but no ship of these types was completed as a
battleship. They were carried by the
Bretagne-class battleships in twin turrets.