Gosaikunda, also spelled Gosainkunda, is an alpine freshwater oligotrophic lake in Nepal's Langtang National Park, located at an elevation of 4,380 m (14,370 ft) in the Rasuwa District with a surface area of 13.8 ha. Together with associated lakes, the Gosaikunda Lake complex is 1,030 ha in size and was designated a Ramsar site on 29 September 2007.

Langtang National Park is a national protected area in north-central Nepal. It was established in 1976 as Nepal's first Himalayan national park and the country's fourth protected area. It covers an area of 1,710 km2 (660 sq mi) in the Nuwakot, Rasuwa and Sindhulpalchok Districts of the central Himalayan region. It contains 26 village communities and includes the Langtang valley. In the north and east it is linked with Qomolangma National Nature Preserve in the Tibet Autonomous Region. The eastern and western boundaries follow the Bhote Koshi and the Trishuli river, respectively.