Helenesee
{{Infobox lake
| name = Helenesee
| image = Helenesee 01.jpg
| caption =
| image_bathymetry =
| caption_bathymetry =
|pushpin_map=Brandenburg
| location = Brandenburg
| coords = {{coord|52|16|16|N|14|29|15|E|region:DE-BB_type:waterbody_source:dewiki|display=inline,title}}
| type = artificial lake
| inflow =
| outflow =
| catchment =
| basin_countries = Germany
| length = ca. {{convert|2.5|km|abbr=on}}
| width = {{convert|0.9|km|abbr=on}}
| area = ca. {{convert|250|ha|abbr=on}}
| depth =
| max-depth = {{convert|56.63|m|abbr=on}}
| volume =
| residence_time =
| shore =
| elevation =
| frozen =
| islands =
| cities =
| reference =
}}
Helenesee is a lake in Brandenburg, Germany. Its surface area is ca. 250 ha. With a depth of 56.63 m, the Helenseee is the second deepest lake in Brandenburg, only surpassed by the lake Großer Stechlinsee. It is situated approximately 8 kilometers in the south of Frankfurt (Oder). It was formed after the flooding of a former open-pit mining which started in 1958.
{{Brandenburg-geo-stub}}