Frigate lieutenant

Flag officers:
Hierarchy of naval officer ranks
Admiral of the navy Admiral of the fleet • Fleet admiral General admiral • Grand admiral • Admiral Squadron admiral • Flotilla admiral Vice admiral • Lieutenant admiral Rear admiral • Counter admiral Commodore admiral • Schout-bij-nacht Port admiral • Commodore
Senior officers:
Fleet captain • Post captain Captain • Ship-of-the-line captain Captain of sea and war • Captain at sea Corvette captain • Commander Frigate captain • Lieutenant commander
Junior officers:
Captain lieutenant • Flag lieutenant Lieutenant • Ship-of-the-line lieutenant Corvette lieutenant • Frigate lieutenant Lieutenant (junior grade) • Sub-lieutenant Ensign
Training officers:
Passed midshipman • Midshipman Naval cadet

Frigate lieutenant is a rank in some navies, especially those of Spain (Spanish: Alférez de Navío) and Latin America, roughly equivalent to a sub-lieutenant in the Royal Navy or a lieutenant (junior grade) in the US Navy. The French Navy equivalent is a ship-of-the-line ensign (first class) (French: enseigne de vaisseau de première classe).

The NATO rank code is OF-1 (senior)