Lüneburg, officially the Hanseatic City of Lüneburg and also known in English as Lunenburg, is a town in the German state of Lower Saxony. It is located about 50 km (31 mi) southeast of another Hanseatic city, Hamburg, and belongs to that city's wider metropolitan region. The capital of the district which bears its name, it is home to roughly 77,000 people. Lüneburg's urban area, which includes the surrounding communities of Adendorf, Bardowick, Barendorf and Reppenstedt, has a population of around 103,000. Lüneburg has been allowed to use the title "Hansestadt" in its name since 2007, in recognition of its membership in the former Hanseatic League. Lüneburg is also home to Leuphana University.

The Principality of Lüneburg was a territorial division of the Duchy of Brunswick-Lüneburg within the Holy Roman Empire, immediately subordinate to the emperor. It existed from 1269 until 1705 and its territory lay within the modern-day state of Lower Saxony in Germany. The principality was named after its first capital, Lüneburg, which was ruled jointly by all Brunswick-Lüneburg lines until 1637. From 1378, the seat of the principality was in Celle. It lost its independence in 1705 when it was annexed by the Electorate of Brunswick-Lüneburg, but retained its vote in the Reichstag as Brunswick-Celle.