Dysgonia algira, the passenger, is a moth of the family Noctuidae.

The species was first described by Carl Linnaeus in 1767 and is found in the Palearctic - from the southern half of Europe and parts of North Africa through West, Central and South Asia.

O. algira L. (= achatina Sulz., triangularis Hbn) Forewing brownish fuscous, with a purplish tinge when fresh; a whitish median band narrowed in middle, edged inwardly by the erect but slightly outcurved inner line, outwardly by the similarly incurved median line: outer line acutely angled outwards on vein 6 and bluntly bent between veins 3 and 4. then sinuous to inner margin near median line; a black apical streak of two spots; the terminal area violet grey: hindwing fuscous, with a diffuse whitish median band: the terminal area grey at middle: fringe grey, below apex whitish; the ab.

[ now full species Dysgonia mandschuriana (Staudinger, 1892) ] is more uniformly purplish or slaty grey, with the median band only slightly paler, not white.

The moth flies from May to August depending on the location.