Corvette lieutenant is a rank in some navies, especially those of Spain and Latin America, roughly equivalent to a Royal Navy acting sub-lieutenant or a US Navy ensign.
The rank did exist in the French Navy during the Ancien Régime, but has now been replaced with ship of the line ensign (second class) (French: enseigne de vaisseau de deuxième classe).
The NATO rank code is OF-1 (junior)
Insignia of a Seefähnrich
also worn by Korvettenleutnant
In the Austro-Hungarian Navy the rank of Korvettenleutnant or tengerészzászlós was the lowest officer rank. Usually only reserve officers were commissioned as Korvettenleutnant. Professional officers would be commissioned as Fregattenleutnant, the next higher rank. Korvettenleutnants would wear the same rank insignia as Seefähnriche.
 See also