Pediasia truncatellus is a species of moth in the family Crambidae described by Johan Wilhelm Zetterstedt in 1839.

It is found in Fennoscandia, northern Russia, the Baltic region, the Czech Republic[2] and Canada.

[4][5] Adults are on wing in June and July in northern Europe and in June North America.

The larvae possibly feed on Sphagnum species.

This article relating to the moth tribe Crambini is a stub.