Oberleutnant (OF-1a) is the highest lieutenant officer rank in the armed forces of Germany (Bundeswehr), Austrian Armed Forces, and Military of Switzerland.
In the German Army, it dates from the early 19th century. Translated as "senior lieutenant", the rank is typically bestowed upon commissioned officers after five to six years of active duty service.
Oberleutnant is used by both the German Army and the German Air Force. In the NATO military comparison system, a German Oberleutnant is the equivalent of a First lieutenant or Poruchik in the Army/Air Forces of Allied nations.
The equivalent naval rank is Oberleutnant zur See.
In Nazi Germany, within the SS, SA and Waffen-SS, the rank of Obersturmführer was considered the equivalent of an Oberleutnant in the German Army.