Lake Sterzh

Infobox lake
lake_name = Lake Sterzh
image_lake = Sterzh.jpg
caption_lake = photographed ca. 1912 by Prokudin-Gorsky
image_bathymetry =
caption_bathymetry =
location = Tver Oblast
coords =
type =
inflow = Volga
outflow = Volga
catchment =
basin_countries = Russia
length = 12 km
width = 1,500 m
area = convert|18|km2|sqmi|0|abbr=on
depth = 5 m
max-depth =
volume =
residence_time =
shore =
elevation =
islands =
cities =

Sterzh Lake is, at 18 km², the third largest among the Valdai Lakes in the Tver Oblast of Russia. It is the first lake through which the Volga flows. The lake's length is 12 km, its width is up to 1,500 metres, the average depth is 5 metres. The lake gives its name to the Sterzh Cross.