Loktak Lake is the largest freshwater lake in northeastern India. It is located near Moirang in Manipur state. It was designated as a wetland of international importance under the Ramsar Convention on March 23 1990.

It is an ancient lake and plays an important role in the economy of Manipur. It serves as a source of water for hydropower generation, irrigation and drinking water supply. The lake is also a source of livelihood for the rural fisherman who live in the surrounding areas and on Phumdis - floating islands, which are actually heterogeneous mass of vegetation, soil, and organic matters at various stages of decomposition.

The Keibul Lamjao National Park, which is the last natural refuge of the Manipur brow-antlered deer (Cervus eldi eldi), is situated in the southeastern region of this lake. It is also the home of other endangered species including a species of python (Python molurus molurus).

Human activities have led to severe pressure on the lake ecosystem.

The lake is managed by the Loktak Development Authority (LDA), which was established in 1987. The LDA produced a management plan in 1993, which emphasized the development of fisheries, agriculture, and tourism.