| Korvettenleutnant | |
| Native Name: | Hungarian: Tengerészzászlós |
| Higher Rank: | Fregattenleutnant |
| Lower Rank: | Seekadett |
| Equivalents: | Seefähnrich Leutnant |
Korvettenleutnant (Hungarian: Tengerészzászlós;) was an officer rank in the Austro-Hungarian Navy. It was equivalent to Leutnant of the Austro-Hungarian Army, as well to Leutnant zur See of the Imperial German Navy. Pertaining to the modern day's NATO rank code it could be comparable to OF-1b.
The right to be promoted to Korvettenleutnant was limited to so-called naval reserve officers only. However, professional officers skipped that rank and were regular promote from Seefähnrich to Fregattenleutnant (also OF-1a), the next higher rank (comparable to Oberleutnant zur See). A Korvettenleutnant wore the same rank insignia as a Seefähnrich.
The rank name was selected in line to the division of war ships to specific ship categories early of the 19th century, e.g. corvette (German: Korvette), frigate (German: Fregatte), and to ship of the line (German: Linienschiff). In the Austro-Hungarian Navy the appropriate rank designations were derived as follows.
According to that systematic the rank designations to subaltern – or junior officers were derived as follows:
This sequence of ranks can be found in the mordern Croatian naval forces.
| junior rank Seekadett | (k.u.k. Kriegsmarine rank) Seefähnrich | senior rank Fregattenleutnant |
| Korvettenleutnant |
The rank designation Korvettenleutnent was used continuously in naval forces of former Yugoslavia and as junior officer (OF-1b) rank in modern today's naval forces of Croatia, Slovenia and Serbia.