Heath Lake is a 6-hectare (15-acre) biological Site of Special Scientific Interest (SSSI) in Berkshire.

[1][2] The SSSI is part of the 22.3-hectare (55-acre) Heathlake Local Nature Reserve, which is owned and managed by Wokingham Borough Council.

It is the only acid lake in the county which retains its characteristic plants, such as alternate water-milfoil and six-stamened waterwort.

The banks are peaty and marshy in some areas.

There are also small areas of woodland, dry heath and acid grassland.