The Partnach is an 18-kilometre-long mountain river in Bavaria, Germany. It rises at a height of 1,440 m on the Zugspitze Massif. The Partnach is fed by meltwaters from the Schneeferner glacier some 1,100 m higher up. The glacier's meltwaters seep into the karsty bedrock and reach the surface again near the source of the Partnach.