Unterwasser is a village in the Toggenburg region of the canton of St. Gallen, Switzerland, situated at the confluence of the two streams forming the upper Thur (known as Säntisthur and Wildhausthur). Formerly part of Wildhaus municipality, it has since 2010 been part of Wildhaus-Alt St. Johann by merger of Wildhaus and Alt St. Johann. It is a relatively small ski resort, and many of its trails are shared with nearby Wildhaus.
The toponym was is first recorded in the 15th century as under dem Wasser , or "below the water". Its population was 685 as of 2010 (down from 751 in 1990; historical population: 81 in 1827). The village was owned by the counts of Montfort in the earlier Middle Ages, later by St. Johann Abbey, and after 1555 by St. Gall Abbey.
- "below" as in "downhill of", in spite of the fact that the name in modern German translates to "below water; underwater".
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