The Partnach Gorge (German: Partnachklamm) is a deep gorge that has been incised by a mountain stream, the Partnach, in the Reintal valley near the south German town of Garmisch-Partenkirchen. The gorge is 702 metres (2,303 ft) long and, in places, over 80 metres (260 ft) deep. It was designated a natural monument in 1912.
Today the river forms the typically narrow valley shape of a gorge (Klamm) in the area of the muschelkalk rocks, while the areas of softer Partnach strata to the north and south have a wider valley cross-section.
The gorge was already being used by local peoples in the 18th century who, at risk of their lives, transported firewood from the Reintal valley on timber rafts to Partenkirchen.