Loktak Lake, Freshwater lake in Moirang, India.

Loktak Lake is a freshwater lake in the Nambol block of Manipur state, India, whose surface is covered with circular vegetation masses that resemble floating carpets. These organic structures, called phumdis, drift freely on the water and form a network of green islands that shift with the current.

Loktak is an ancient lake in the Manipur Valley, fed by the Manipur, Nambul, Nambol, Yangoi and Thongjaorok rivers and drained at the Ithai barrage. It was designated a wetland of international importance under the Ramsar Convention on 23 March 1990, and listed on the Montreux Record on 16 June 1993 because its ecological character was changing. Around 55 hamlets holding some 100,000 people depend on it for fish, water and hydropower.

In Meitei, lok means "stream" and tak "the end", so the name describes the lake as the terminus of the streams feeding it. Fishing families live on the floating phumdis, called phumshangs, and Loktak Day is observed each 15 October along the lake's edge.

Access is through nearby towns, from where boats take visitors onto the water. The best time to visit is between November and February, when the air is clear and temperatures remain comfortable.

A national park sits directly on the water and shelters the only population of Sangai deer, which have adapted to life on the floating mats. Visitors can sometimes watch the animals grazing on the green islands, where they search for food among reeds and grasses.