Brachyhesma cooki, or Brachyhesma (Microhesma) cooki, 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 eastern Australia. The type locality is Botany Bay, near Sydney in New South Wales. Other published localities include Amiens and Stanthorpe in south-eastern Queensland.
The adults are flying mellivores. Flowering plants visited by the bees include Leptospermum and Eucalyptus species.