The Kleiner Knollen is a 631 metre high mountain in the southwestern part of the Harz in the German state of Lower Saxony.

The Kleiner Knollen is located east of Herzberg am Harz, northeast of Scharzfeld, northwest of Bad Lauterberg im Harz and south of Sieber.

It is dominated by the Großen Knollen (687 m), about 1 km to the northeast.

In 1596 it was entirely covered in beech trees, in 1630 also partly with sycamore.

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