Heidfeld is a Naturschutzgebiet (nature reserve) in Lower Saxony in the area of Engden in the Schüttorf Samtgemeinde in the County of Bentheim and the municipality of Emsbüren in Landkreis Emsland.
The nature reserve is designated NSG WE 241 and has an area of 200 hectares. 164 of its hectares are located in Bentheim while 36 hectares lie within Emslands.
The nature reserve is between Schüttorf und Emsbüren and to the west of A 31. It is located in a protected forest area, that is also home to an environmentally friendly foresty industry. In a share of the protected area some of its trees are taken for commercial use. Since 1998, 36.8 hectares of the forest areas are designated as protected.
The Ahlder flows through the north-eastern area of this nature reserve.
At the time, the forest was mostly a Mixed coniferous forest, that would be foster English oak and Book-English Oak trees.
The area has been under protected as a nature reserve since December 12, 2003. It was placed under the appropriate conversation authority in Landkreis Emsland.