Stausee Ferden
{{Expand German|topic=lake|date=March 2025|Stausee Ferden}}
{{Infobox lake
| name = Stausee Ferden
| image = Lonzastausee k.jpg
| caption =
| image_bathymetry =
| caption_bathymetry =
| coords = {{coord|46|23|16|N|7|45|26|E|type:waterbody_region:CH-VS_source:dewiki|display=inline,title}}
| type = reservoir
| inflow = Lonza
| outflow = Lonza
| catchment = {{convert|139.2|km2|abbr=on}}
| basin_countries = Switzerland
| length =
| width =
| area = {{convert|10.6|ha|abbr=on}}
| depth =
| max-depth =
| volume = {{convert|1.89|e6m3|acre.ft|abbr=out}}
| residence_time = 36 hours
| shore =
| elevation = {{convert|1311|m|abbr=on}}
| islands =
| cities =
| pushpin_map=Canton of Valais#Switzerland#Alps
| pushpin_label_position= bottom
| pushpin_relief = y
| embedded = {{Infobox mapframe |wikidata=yes |zoom=14 |coord={{WikidataCoord|display=i}}}}
}}
__NOTOC__
Stausee Ferden ("Ferden reservoir") is a reservoir on the Lonza river at Ferden, Valais, Switzerland. Its surface area is {{convert|10.6|ha|abbr=on}}.
The lake has the shortest lake retention time in the world.