Aphnaeus marshalli, the Marshall's highflier, is a butterfly in the family Lycaenidae. It is found in Tanzania (from the south-western part of the country to Kigoma), the Democratic Republic of the Congo (from the south-eastern part of the country to Katanga Province), Zambia and north-eastern Zimbabwe. The habitat consists of Brachystegia woodland. Both sexes mud-puddle. Adults are on wing in September and October. The larvae feed on Julbernardia globiflora and Brachystegia boehmii.