Callohesma ornatula is a species of bee in the family Colletidae and the subfamily Euryglossinae. It is endemic to Australia. It was described in 1929 by British-American entomologist Theodore Dru Alison Cockerell.
The species occurs in south-eastern Australia. The type locality is Brisbane in Queensland. Other published localities include Sydney and Lugarno in New South Wales, and Mount Yule, near Healesville in Victoria.
The adults are flying mellivores. Flowering plants visited by the bees include Eucalyptus species.