Hundekehlefenn, Protected area in Charlottenburg-Wilmersdorf, Germany.

Hundekehlefenn is a ten-hectare moorland nature reserve in Berlin's Grunewald forest, within Charlottenburg-Wilmersdorf. It occupies a glacial channel linking the Grunewaldsee to the south with the Hundekehlesee to the north, with the Hundekehlekanal running along its eastern edge. The site combines a largely drained marshy hollow with open meadows and scattered birches, where the channel form of the Grunewald lake chain remains visible.

The Hundekehlefenn has been a ten-hectare nature reserve, classified as a moor, since 1987. The forest office on its western edge, built in 1907 as a police riding post with a prison and stable, has been the Hundekehle forestry office since 1923. The building later served as a filming location for Scotland Yard jagt Dr. Mabuse in 1963 and the television series Förster Horn in 1966.

The name may derive from 'Hundequele', a gathering place for dog packs during driven hunts, possibly linked to nearby Jagdschloss Grunewald. Name expert Schlimpert instead traces it to 'hunt' (a field measure) and 'kele' (ravine). The Low German 'Fenn' means a marshy inland lake, a term brought by Flemish settlers in the 12th century.

The area is accessible via several marked hiking trails that offer different lengths and difficulty levels. Visitors should wear sturdy footwear, as the soggy ground can become muddy, especially after rain.

The name may come from "Hundequele", a gathering point for hunting dog packs, which would fit the nearby Grunewald hunting lodge; the name expert Schlimpert instead derives it from hunt (a field measure) and kele (ravine). On the west side above the fen stands the Grunewald forestry office, built in 1907 as a mounted police post with prison, quarters and stables; it served as a film location for Scotland Yard jagt Dr. Mabuse in 1963 and Förster Horn in 1966.