Dittmern is a village in the borough of Soltau in the Heidekreis district in the German state of Lower Saxony.
The hamlets of Friedrichseck, Hambostel, Grüne Aue, Heidenhof and Höpenhof belong to the parish of Dittmern.
Dittmern lies on the Lüneburg Heath northeast of Soltau on the Große Aue river.
The district roads (Kreisstraßen) K 2 and K 9 and the A 7 motorway run through the parish.
A motorway junction, Heideregion, in the vicinity of Dittmern, is currently being planned.