Indigo Lake

Infobox lake
lake_name = Indigo Lake
image_lake = IndigoLakeAlaska1.jpg
caption_lake = Indigo Lake in mid-spring
image_bathymetry =
caption_bathymetry =
location = Baranof Island, Sitka City and Borough, Alaska, USA
coords = coord|57|00|50|N|134|03|53|W|region:US-AK_type:waterbody|display=inline,title
type = Glacial lake, tarn
inflow =
outflow =
catchment =
basin_countries = United States
length = convert|.8|mi|abbr=on|lk=on
width = convert|.5|mi|abbr=on|lk=on
area =
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max-depth =
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residence_time =
shore =
elevation = convert|2448|ft|abbr=on|lk=on
islands =
cities =

Indigo Lake or simply Indigo is a lake lying ten miles southeast of central Sitka, on the western coast of Baranof Island in the Alexander Archipelago of Alaska at coord|57|00|50|N|134|03|53|W|region:US-AK_type:waterbody.

The name was reported in 1954 by local Sitkan Robert N. DeArmond to the USGS and was so named because its intensely and mysteriously indigo blue color. The lake about eight tenths of a mile across and long (a circular shape) with very steep and cliffed walls. It is very dangerous, near impossible, to reach the actual waters of the lake.

The southern ridge of Indigo Lake plays an important part in the trail to Peak 5390.