Hooker Lake is a proglacial lake that started to form in the late 1970s by the recent retreat of the Hooker Glacier. It is in the Hooker Valley, in the Aoraki / Mount Cook National Park in New Zealand's South Island, just south of Aoraki / Mount Cook.

The geographic Hooker items were named by the Canterbury provincial geologist, Julius von Haast, after British botanist William Jackson Hooker.

Hooker Lake's length has doubled between 1990 and 2013 from 1.2 kilometres to 2.3 kilometres, the glacier retreating by over 50 metres (160 ft) per year. It is expected to grow by another 4 kilometres (2.5 mi) as Hooker Glacier retreats further up the valley until the glacier's retreat will have reached the point where the glacier bed is higher than the lake's water level.

The lake is one of the most accessible glacier lakes and can be reached year-round from the White Horse Hill camp ground near Mount Cook Village via the well-formed Hooker Valley Track. The track ends at a lookout point at the lake's shore, with a short path providing easy access to the shore.

In the warmer months icebergs can typically be seen floating in the water. The icebergs slowly drift from the terminus of the glacier at the northern end of the lake until close to the shore. The lake's water temperature is typically lower than 2 °C (36 °F).

In winter, the lake freezes over.

Hooker Lake drains into Hooker River, its glacial waters blueish light grey due to the suspended glacial rock flour.

No boats tour the lake, but they do the large, nearby Tasman Lake.

• Climate change in New Zealand