Achit Lake (Mongolian: Ачит Нуур, ᠠᠴᠢᠲᠤᠨᠠᠭᠤᠷ, Chinese: 阿奇特湖) is the largest freshwater lake in Uvs Aimag (Uvs province), Mongolia, in the west of the country. At an elevation of 1,435 m above sea level it covers an area of 290 km. It is 28 km long, 16 km wide, and 10 m deep. The coast is covered with steppes, mostly hilly but swampy on the northwest and northeast. Several rivers flow into the lake.

• Ramsar sites in Mongolia

• The Annotated Ramsar List: Mongolia
• Big Soviet Encyclopaedia – Russian (АЧИТ-НУР)
• Limnological Catalog of Mongolian Lakes