The Apenke is a left tributary of the Söse in Osterode in the Harz Mountains in the German state of Lower Saxony.

It flows initially parallel to the Eipenke stream in a southwesterly direction.

For the rest of its course the Apenke flows northwest and feeds the ponds of Kaiserteich and Pferdeteich.

In 1991, the Apenke was polluted in Osterode by 8 m3 (280 cu ft) of diesel fuel.

The following is a translation of the verses (rhyming in the original German) written by Manfred Kleiner about the Apenke: