Neolithocolletis mayumbe is a moth of the Gracillariidae family. It is endemic to the Democratic Republic of Congo. The habitat consists of West African primary forest. The length of the forewings is about 2.1 millimetres (0.083 in). The forewings are elongate and the ground colour is shiny golden, with indistinct fasciate whitish markings, intermixing with the ground colour of the forewing and dark beige scales. The hindwings are silvery shiny greyish white. Adults have been recorded on wing in late March.