Xanthesma flava, or Xanthesma (Xanthesma) flava, is a species of bee in the family Colletidae and the subfamily Euryglossinae. It is endemic to Australia. It was described in 1965 by American entomologist Charles Duncan Michener.
The species occurs in Western Australia, the Northern Territory and Queensland. The type locality is Turn-off Lagoons, on the Nicholson River, in the Gulf Country of north-west Queensland.
The adults are flying mellivores. Flowering plants visited by the bees include Eucalyptus species.