Frigate captain is a naval rank in the naval forces of several countries.
It is, usually, equivalent to the Commonwealth/US Navy rank of commander.
Countries using this rank include Argentina and Spain (Spanish: capitán de fragata), France (French: capitaine de frégate), Belgium (Dutch: fregatkapitein), Italy (Italian: capitano di fregata), Brasil and Portugal (Portuguese: capitão de fragata) and Germany (German: fregattenkapitän) .
The NATO rank code is OF-4, the official translation for instance of the German fregattenkapitän as well as the French capitaine de frégate into English is "commander senior grade".[1]
The Russian/Soviet equivalent is "captain of the 2nd rank" (капитан 2-го ранга)