Unterlüß is a village and former municipality located in the district of Celle within the state of Lower Saxony, Germany. Geographically, it is situated approximately 30 km northeast of Celle and 25 km southwest of Uelzen.
On January 1, 2015, Unterlüß officially became part of the municipality of Südheide. The village serves as a station on the railway line connecting Hanover and Hamburg.