Rasuwa District (Nepali: रसुवा जिल्ला is one of 13 districts of Bagmati Province and one of seventy-seven districts of Nepal. The district, with Dhunche as its district headquarters, covers an area of 1,544 km2 and has a population of 43,300. Its District Post Office has a Rasuwa DPO code of 45000. There are five post offices in the district. As per census 2011 total households in Rasuwa district were 9,778. It is the smallest district by area, among 16 districts in the Himalaya region of Nepal.

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.