Lago Rivadavia is a glacial lake in Chubut Province, Argentina, situated in the Andes at approximately 42°36'S, 71°39'W. It occupies a narrow north-to-south valley between glaciated peaks and forms part of the Futaleufú River system, which ultimately drains westward through Lago Yelcho and the Yelcho River into the Pacific Ocean in Chile. The Carrileufú River is the primary inflow, and the lake's outlet feeds the Río Rivadavia, which flows downstream into Lago Verde. All of the lake except its northern tip lies within Los Alerces National Park, a UNESCO World Heritage Site.

Argentina Provincial Highway 71, unpaved as of 2016, follows the eastern shoreline and provides the primary road access to the lake. The small settlement of Villa Lago Rivadavia sits roughly 3 kilometres from the northern edge of the lake. Facilities along the eastern shore are minimal, consisting of a few campgrounds near the highway.

Paddlers use the lake as a launching point for float trips down the Río Rivadavia. Motorized boats are permitted on the lake itself — fishing guides have been observed running outboard-powered craft from the lake's source down to the river mouth — but motorized craft are not allowed on the rivers within the national park. The Río Rivadavia flows out of the lake and into Lago Verde, making a continuous lake-to-river-to-lake route possible. Wind can be a factor on the open water, with heavy breezes encountered while paddling across the lake near the Rivadavia inlet into Lago Verde.

The lake is set against a backdrop of glaciated Andean peaks and surrounded by forests of larch and cypress. The waters are emerald green and clear. Brown trout and rainbow trout are present in the lake and the connecting river system, which draws fly fishing activity throughout the area. Organized kayak events have been held in the broader Los Alerces lake system, including a training clinic held on Lago Rivadavia itself, indicating the lake is suitable for kayaking. Because the lake falls almost entirely within Los Alerces National Park, paddlers should be aware that national park regulations apply, including the prohibition on motorized craft in the park's rivers.