Astarte Horn () is a pyramidal peak lying about inland from George VI Sound at the south end of the north-south range extending to Mount Umbriel, in eastern Alexander Island. The feature was mapped from trimetrogon air photography taken by the Ronne Antarctic Research Expedition, 1947-48, and from survey by the Falkland Islands Dependencies Survey, 1948-50, and named by the United Kingdom Antarctic Place-Names Committee in association with nearby Venus Glacier; the goddess Venus being identified with the Phoenician goddess Astarte in mythology.