Lake Marian is an alpine lake at the southern end of the Darran Mountains in the Fiordland National Park in the South Island of New Zealand. The lake is located just above the treeline in a hanging valley leading northwest from the Hollyford Valley near The Divide pass. The valley is sheltered by steep snow-covered peaks of over 2,000 metres (6,600 ft) on all sides apart from the entrance.

The lake is fed and drained by Marian Creek which in turn feeds into the Hollyford River. Marian Creek's catchment upstream of Lake Marian includes several permanent snowfields in a cirque at the head of the valley northeast of the peak of Mount Crosscut. There the creek drains two smaller alpine lakes, Lake Mariana and Lake Marianette, followed by the 122 metres (400 ft) tall Lyttle Falls, before it reaches Lake Marian.

A 3-hour return tramping track leads to the lake from a car park along the Hollyford Road, only 1 kilometre in from the Milford Road (SH94).

- Wikipedia