Dichomeris decusella is a moth in the Gelechiidae family. It was described by Walker in 1864. It is found in Sri Lanka, India and Yemen (Socotra). The wingspan is 15–16 mm. The forewings are pale brownish testaceous, speckled with black and with some short oblique fuscous streaks along the costa, as well as a few groups of scales at the middle and the end of the cell, as well as on the dorsum before the tornus and at the termen. There is also one erect black dorsal patch at one-sixth from the base. The hindwings are brownish grey, somewhat iridescent along the middle.