Brachyhesma triangularis, or Brachyhesma (Brachyhesma) triangularis, is a species of bee in the family Colletidae and the subfamily Euryglossinae. It is endemic to Australia. It was described in 1977 by Australian entomologist Elizabeth Exley.
The species occurs in the Gascoyne region of Western Australia. The type locality is 13 km south of Carnarvon.
The adults are flying mellivores. Flowering plants visited by the bees include Eucalyptus species.