Ardozyga arenaria is a species of moth in the family Gelechiidae. It was described by Turner in 1933. It is found in Australia, where it has been recorded from Queensland. The wingspan is 17-18 mm. The forewings are brown or brown-whitish with the costa broadly and suffusedly whitish from the base to beyond the middle. The basal one-sixth of the costal edge is dark fuscous and there are fuscous costal dots at one-sixth, the middle, and four between this and the apex. The stigmata are fuscous, the first discal at one-third, the plical beyond it, the second discal at two-thirds, and a dot beneath it, both within a transverse whitish suffusion. There is a dot between and above the discals, as well as a narrow fuscous apical suffusion containing a series of pale marginal dots. The hindwings ar