Leioproctus calcaratus, or Leioproctus (Baeocolletes) calcaratus, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by American entomologist Charles Duncan Michener in 1965.
Etymology The specific epithet calcaratus is an anatomical reference to the thick, curved, hind tibial spurs.
Description Female body length 6.5 mm, forewing length 4.3 mm. Integumental colouration mainly black, hair white and brown.
Distribution and habitat The species occurs in Western Australia. The type locality is Belele Station.
Behaviour The adults are flying mellivores.
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