Hirschacker and Dossenwald is a nature reserve and a supplementary landscape conservation area between Mannheim and Schwetzingen in the Rhine-Neckar district in Baden-Württemberg. It belongs to the Schwetzinger Sand natural area and comprises one of the most important drift sand areas in Baden-Württemberg. The dune range has calcareous dunes up to 13 metres high, sloping steeply to the east. To the west is the drifting sand field and to the east the Neckar alluvial fan.
The name "Dossenwald" is derived from "Dosse", the old German word for pine.
