Griebnitzsee (German: [ˈɡʁiːpnɪtsˌzeː] ⓘ, from the Slavic Grib, Mushroom) is a lake at the south-western outskirts of Berlin, the capital city of Germany.

At its eastern end, near Kohlhasenbrück in Berlin, the Griebnitzsee receives water from the Teltow Canal.

One third of this water[citation needed] flows into the adjacent Griebnitz Canal and through a chain of lakes towards the Großer Wannsee.

The navigable Griebnitz Canal provides an alternative link from the Griebnitzsee to the River Havel via the Großer Wannsee.

A patrol path existed for border guards along the southern and western shore.