The Sipiso-piso is a plunge waterfall in the Batak highlands of Sumatra, Indonesia. It is formed by a small underground river of the Karo plateau that falls from a cave in the side of caldera of Lake Toba, some 120 metres (390 ft) down to lake level. Sipiso-piso is a well-known tourist attraction and a nearby vantage point offers views of the falls and lake.

Sipiso-piso waterfall is located in the Tanah Karo regency in North Sumatra, at the northernmost tip of the Lake Toba caldera, near the fishing village of Tongging. The closest municipality is the town of Kabanjahe, about 25 km (16 mi) away,