Uglich Reservoir

Infobox lake
lake_name = Uglich Reservoir
image_lake = Uglich shluz.jpg
caption_lake = A lock at Uglich Reservoir
image_bathymetry =
caption_bathymetry =
coords = coord|57|29|N|38|16|E|type:waterbody_region:RU|display=inline,title
type = Hydroelectric reservoir
inflow = Volga, Medveditsa, Kashinka, Nerl
outflow =
catchment =
basin_countries = Russia
length = 143 km
width = 5 km
area = 249 km²
depth = 5 m
max-depth =
volume = 1.24 km³
shore =
elevation =
islands =
cities = Kaliazin, Kimry

Uglich Reservoir or Uglichskoye Reservoir ( _ru. Угличское водохранилище) is an artificial lake in the upper part of the Volga River formed by a hydroelectric dam built in 1939 in the town of Uglich. It is located in Tver and Yaroslavl Oblasts of Russia. The Uglich Reservoir has a surface area of 249 km² and a water volume of 1,2 cubic km. Its length is 143 km, major width - 5 km, average depth - 5 m (with maximum depth equaling 23 m). The Uglich Reservoir was created for the benefit of transportation, energetics, and water supply. It also performs seasonal flow regulation. The cities of Uglich, Kalyazin, and Kimry are located on the shores of the Uglich Reservoir.

The construction of the dam led to a 15th-century monastery in Uglich and 16th-century monastery in Kalyazin being submerged by the artificial lake.