Leutnant (German pronunciation: [ˈlɔʏtnant]; OF-1b) is the lowest Lieutenant officer rank in the armed forces of Germany (Bundeswehr), Austrian Armed Forces, and military of Switzerland.
The German noun (with the meaning “Stellvertreter” (in English "deputy") from Middle High German «locum tenens» Platzhalter (in English "place holder") was derived from the French word «Lieutenant» about 1500. In most German-speaking armies it is the lowest officer rank (in German-speaking navies «Leutnant zur See» (English "Lieutenant at sea"). In the German Bundeswehr the ranks Leutnant OF1b and Oberleutnant OF1a belong to the Leutnant rank group. In some other armed forces (such as the former National People's Army) there is the lower grade of Unterleutnant (OR1c).
From about 1500 until the middle of the 17th century the designation of «Leutnant» was commonly used for any deputy to a commanding officer. So at the army level there was the appointment of General-Leutnant (English "lieutenant-general"), at the regimental level there was that of Oberst-Leutnant (English "lieutenant-colonel"), and at the company level the Leutnant was deputy to a Hauptmann (English "captain").
With the formation of standing armies in the second half of the 17th century, the term commonly came to designate the rank of the least senior commissioned officer.
In the 18th and 19th century, at the unit level several Leutnants served as platoon leaders. At that time the ranks of Premier-Lieutenant and Seconde-Lieutenant came into existence. With effect from January 1, 1899 in the German Empire these ranks were renamed as Oberleutnant and Leutnant.
The term «Leutnant» (OF1b-rank) has been used in German armed forces since 1899.
In the Bundeswehr today the «Leutnant» (OF1b-rank) will be normally appointed as platoon leader. However, the rank of «Leutnant» might also be held while a junior officer is studying at the University of the German Federal Armed Forces or at another training or education establishment. The «Leutnant» of the Bundeswehr belongs to the Leutnant’s rank group (also: subaltern officer rank group).