Ostenholz Moor (German: Ostenholzer Moor) is a raised bog on the Lüneburg Heath in the German state of Lower Saxony. It is named after the village of Ostenholz and is not far from Meißendorf. The bog is almost entirely within the Bergen-Hohne Military Training Area and, as a result, has been largely left to develop naturally. The River Meiße separates Ostenholz Moor from the nature and bird reserve of the Meißendorf Lakes and Bannetzer Moor.