Lake Kaiavere () is a lake in Estonia. It is mostly located in the village of Otslava in Tartu Parish, Tartu County, with a smaller part in the neighboring village of Kaiavere.
The lake has an area of . The lake has an average depth of and a maximum depth of . It is long, and its shoreline measures . It has a volume of .
The area around the lake is relatively low, mostly covered by wet meadows. The shores are low and muddy, with some quaking bogs at the ends of the lake. The northeastern shore is peaty, and in the southwest there are also sandy and gravelly shorelines. Deeper in the lake, the bottom is covered by a layer of mud. Among waterbirds, great crested grebes, mallards, and tufted ducks nest on the lake.