Dahlem is a municipality in the district of Lüneburg, in the state of Lower Saxony, Germany. It lies in the northern part of the country, within the administrative region centred on the town of Lüneburg.
The municipality covers an area of 16.99 square kilometres and has a population of 527. It is therefore a small, sparsely populated rural community, with a population density of roughly 31 inhabitants per square kilometre.
Dahlem should not be confused with the better-known Dahlem district of Berlin, which shares its name but is a separate place located in a different part of Germany.