Hohenlohe-Langenburg was a German county and later principality in the Holy Roman Empire. It was located around Langenburg in what is now northeastern Baden-Württemberg, Germany. Starting in medieval times and continuing until 1806, this small state was ruled by a branch of the House of Hohenlohe, first as lords, then as counts and ultimately as ruling princes of the Holy Roman Empire after 1764. The princely House of Hohenlohe-Langenburg still owns and lives in Langenburg Castle today.

The House of Hohenlohe is a German princely dynasty. It formerly ruled an immediate territory within the Holy Roman Empire, which was divided between several branches. In 1806, the area of Hohenlohe was 1,760 km² and its estimated population was 108,000. The motto of the house is Ex flammis orior. The Lords of Hohenlohe were elevated to the rank of Imperial Counts in 1450, and from 1744, the territory and its rulers were princely. In 1825, the German Confederation recognized the right of all members of the house to be styled as Serene Highness, with the title of Fürst for the heads of its branches, and the title of prince/princess for the other members. From 1861, the Hohenlohe-Öhringen branch was also of ducal status as dukes of Ujest.