Dichomeris plumbosa is a moth in the family Gelechiidae. It was described by Edward Meyrick in 1913. It is found in Mpumalanga, South Africa.
The wingspan is . The forewings are rather dark slaty fuscous, with a few scattered black scales and a cloudy dark fuscous transverse dot above the fold at one-fourth. The stigmata are cloudy, dark fuscous, the plical somewhat obliquely before the first discal. There is also a whitish dot on the costa at two-thirds, where a very faint pale slightly curved shade crosses the wing. Some black dots are found around the posterior part of the costa and termen. The hindwings are rather dark grey.