Pyrausta purpuralis is a species of moth of the family Crambidae.

It was described by Carl Linnaeus in his 1758 10th edition of Systema Naturae Is found in Europe.

The forewings are purple, more or less mixed with dark grey; markings ochreous yellow, black-edged; an oblique fascia near base, not reaching costa; a spot in middle of disc; an irregular postmedian fascia, sometimes broken into three spots; sometimes a subterminal streak, not reaching apex.

The larva is dark grey; dorsal and spiracular lines yellowish; spots black, whitish-edged.

[1] The moth flies from May to September depending on the location.