Linienschiffsleutnant
| .svg.png) in Austria-Hungary | |||
| 
 | |||
| Rank insignia | Austro-Hungarian Navy | ||
| Introduction | 19th century | ||
| Rank group | Commissioned officers | ||
| Army / Air Force | Hauptmann | ||
| Navy | Linienschiffsleutnant | ||
| NATO equivalent | OF-1a | ||
Linienschiffsleutnant (Hun: Fregatthadnagy / en: translation Ship-of-the-line lieutenant) was an officer rank in the Austro-Hungarian Navy. It was equivalent to Hauptmann of the Austro-Hungarian Army, as well to Kapitänleutnant of the Imperial German Navy. Pertaining to the modern day's NATO rank code it could be comparable to OF-2.
The rank designation was used continuously in the Austria-Hungarian follow on countries Yugoslavia, Croatia, and Slovenia, as well as in the modern day´s Austrian merchant navy.
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 (de: Korvette), frigate (de: Fregatte), and to ship of the line (de: Linienschiff). In the Austro-Hungarian Navy the appropriate rank designations were derived as follows.
- Korvettenkapitän OF-3 (equivalent: to Heer Major)
- Fregattenkapitän OF-4 (equivalent: to Heer Oberstleutnant)
- Linienschiffskapitän OF5; (equivalent: to deutsche Marine Kapitän zur See / Heer Oberst)
According to that systematic the rank designations to subaltern – or junior officers were derived as follows:
- Korvettenleutnant OF-1b (equivalent to deutsche Marine Leutnant zur See Heer: Leutnant)
- Fregattenleutnant OF-1a (equivalent to deutsche Marine Oberleutnant zur See / Heer: Oberleutnant)
- Linienschiffsleutnant OF-2 (equivalent to deutsche Marine Kapitänleutnant / Heer:Hauptmann)
This sequence of ranks can be found in the today´s naval forces of Croatia, and Slovenia.
| junior rank Fregattenleutnant |  (k.u.k. Kriegsmarine rank) Linienschiffsleutnant | senior rank Korvettenkapitän | 
Other countries
The rank designation Linienschiffsleutant was used continuously in naval forces of former Yugoslavia and as (OF-2) rank in modern today’s naval forces of Croatia, and Slovenia.
| Rank insignia Linienschiffsleutnant OF-2 | ||||
|---|---|---|---|---|
| Country | Croatia | Slovenia | ||
|  Croatian Navy |  Slovenian Navy | |||
| Shoulder sleev |  |  |  | |
| Native designation | Poručnik bojnog broda | Poročnik bojne ladje | ||
