Brachyhesma dedari, or Brachyhesma (Brachyhesma) dedari, is a species of bee in the family Colletidae and the subfamily Euryglossinae. It is endemic to Australia. It was described in 1968 by Australian entomologist Elizabeth Exley.
The species occurs in Western Australia. The type locality is Dedari, some 64 km west of Coolgardie.
The adults are flying mellivores. Flowering plants visited by the bees include Eucalyptus species.