Lake Sumner, known as Hoka Kura in Māori, is a highland lake situated 100 km (62 mi) northwest of Christchurch in the North Canterbury Region of New Zealand's South Island.

The Lake Sumner region is a popular area for hunting, tramping, trout fishing, whitewater kayaking and mountain biking.

Several Department of Conservation tramping huts in the region make it a common destination for overnight trips; however, the area's comparatively remote location and difficult vehicle access mean it is seldom crowded.

Hoka Kura is a cold inland oligotrophic lake formed approximately 18,000 years ago.

The North Branch of the upper Hurunui River enters the lake via a shingle delta at the northwestern end and drains through a narrow natural channel at the southeastern end of the lake.