Unterach is a village in the Austria state of Upper Austria on the southern shore of lake Attersee in the centre of the Salzkammergut region.

The name derives from the Austro-Bavarian Untr|aha ~ between|waters based on the geographical location on the shore of lake Mondsee and lake Attersee.

The arms were granted on 1980-08-25 by the government of Upper Austria based on a resolution of the Town Council of 1979-11-09.

(Exception: E. Gnigler got appointed by the town council in 2007.)

The 1 to 2 vice-chairs are elected by the town council; likewise the allocation of responsibilities is decided by the town council.