Villa Effertz, Historical villa in Buchholz-Kleefeld, Germany.

Villa Effertz stands with a natural stone facade, half-timbered gable, and a round corner tower at Spinozastraße 5 in Hannover. This three-story residential building combines sandstone and timber-frame construction in its design.

Architect Arthur Heinrichs built the villa in 1909 for Reinhard Effertz, who had directed the Königsborner AG for mining, saltworks and spa operations on the eastern edge of the Ruhr until 1910 and retired to Hannover. After Effertz died in 1930, the building passed to the city of Hannover in the 1930s. A renovation in the early 1990s converted the attic into a room 7.5 metres high.

The building displays neo-Romanesque features with medieval castle influences, seen in its sandstone construction and pronounced half-timbered facades across three floors.

The building sits easily accessible on Spinozastraße in the Buchholz-Kleefeld neighborhood and can be viewed from the street. Visitors can observe the facade and architectural details from the roadside.

After the war the villa became a transit home for former concentration camp prisoners, and in 1945 the newly founded Jewish community of Hannover held its first service there since the Nazi era. The street, renamed Nietzschestraße in 1936, reverted to Spinozastraße the same year.