Alenia sandaster, the Karoo dancer or Karoo sandman, is a butterfly of the Hesperiidae family. It is only known from the arid Nama Karoo of the eastern part of the West Cape, the central North Cape and the western East Cape in South Africa.
The wingspan is 22–27 mm for males and 26–28 mm for females. Adults are on wing from August to January (with a peak from September to November). There is one extended generation per year.