Mueller Lake is a glacial proglacial lake located in the Hooker Valley within Aoraki/Mount Cook National Park, Canterbury, New Zealand, sitting at an elevation of approximately 770 metres. The lake is fed by the Mueller Glacier and is characterised by brilliant blue glacial waters that contain floating icebergs calved from the glacier terminus. The surrounding landscape includes the peaks of the Southern Alps, Mount Sefton, and views toward Aoraki/Mount Cook, making it a visually dramatic paddling environment.

Access to the lake is via the Hooker Valley Road car park, from which paddlers follow a short trek — using a dedicated track operated by the commercial guiding company — to a gear shed and launch site. Independent paddlers should note that the commercial operator (Glacier Kayaking, departing from the Old Mountaineers Café adjacent to the DOC Visitor Information Centre in Mount Cook Village) runs guided tours on the lake, and the access track to the water appears to be exclusive to that operation. Prospective independent paddlers should confirm access arrangements with the Department of Conservation before planning a trip.

The lake presents genuine hazards associated with glacial environments, including floating icebergs and cold glacial water. Winds driven by westerly frontal systems crossing the Southern Alps can produce strong, dangerous conditions with little warning; the commercial operator makes daily weather assessments before proceeding. Given the glacial source, water temperatures are extremely cold year-round.

The commercial guided experience uses double kayaks fitted with outriggers for stability and is described as suitable for people with some prior kayaking experience; a minimum age of 14 years applies to the guided tours. Guided afternoon departures are timed at 2:30 PM from the village, with the option to combine a morning trip on the nearby Tasman Glacier Lake. The lake sees relatively few visitors compared to the adjacent Hooker Valley walking track, contributing to a quiet, remote atmosphere. Paddlers should carry warm clothing, a rain jacket, sun protection, and personal supplies, as conditions can change rapidly in the alpine environment.