Lac de Sylans

Infobox lake
lake_name = Lac de Sylans
image_lake = Autoroute A40 01.jpg
caption_lake =
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location = Ain
coords = coord|46|9|40|N|5|39|50|E|type:waterbody_region:FR|display=inline,title
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catchment =
basin_countries = France
length =
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elevation = 584 m
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frozen =

Lac de Sylans is a lake at Le Poizat in the Ain department, France.

Ruins of old buildings remind of ice harvesting on the lake in the 19th and early 20th centuries (1865-1917).