The House of Reuss-Greiz was a branch of the German noble family known as the House of Reuss. It ruled the principality of Greiz in the region of Thuringia from the 17th century until the end of the German monarchies in 1918. The family is known for its contributions to local governance and culture during its reign. The principality was characterized by its small size and rich history, with the Reuss-Greiz family playing a significant role in the political landscape of the time. The family members often held various titles and positions within the broader context of the Holy Roman Empire and later the German Empire.