Astictopterus inornatus, the modest sylph, is a butterfly of the family Hesperiidae. It is found in South Africa in Afromontane forests from the East Cape, east along the Drakensberg foothills to the KwaZulu-Natal midlands and the coastal forests and rivers. The wingspan is 24–29 mm for males and 27–29 mm for females. Adults are on wing from September to April (with a peak in January). There are multiple generations per year. The larvae feed on Imperata cylindrica and Imperata arundinacea.