Parathectis sordidula is a moth of the Gelechiidae family. It was described by Meyrick in 1913. It is found in South Africa and Namibia. The wingspan is 6–8 mm. The forewings are ochreous-whitish, variably tinged, sprinkled, or irrorated with grey. There is a grey elongate dot on the fold at one-fourth. The stigmata are small and dark grey, with one or two blackish scales, the plical very obliquely beyond the first discal. The hindwings are grey.