Captain general of the Navy (Spanish: Capitán general de la Armada) is the highest naval officer rank of the Spanish Navy, rated OF-10 with the NATO ranking system.

A peculiar usage of the term captain general arose in the Spanish Navy of the 16th century.

The fleet second-in-command was the admiral, an officer appointed by the capitan-general and responsible for the seaworthiness of the squadron.

[1][page needed] Since King Amadeo's reign (1871–1873), the monarchs used captain general of the Navy rank and insignia as Commander-in-chief.

Briefly abolished by the Second Spanish Republic, it was restored in 1938 during the regime of Francisco Franco, a General of the Army.