Delfin-class submarine

Delfin class submarine may refer to one of the following classes of submarine:


 * Greek Delfin class submarine, a French-built class of two submarines built for the Royal Hellenic Navy in 1910; active in the First Balkan War; both boats seized by France during the Greek National Schism in 1916 and used during World War I; returned to Greece after the war and both stricken in 1920
 * Soviet or Russian Delfin class submarine, an alternate name for the Delta IV class of nuclear, ballistic-missile submarines employed by the Soviet and Russian Navies