Leioproctus incomptus, or Leioproctus (Leioproctus) incomptus, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by British-American entomologist Theodore Dru Alison Cockerell in 1921.

Description Female body length is about 9 mm. Colouration is mainly black; the abdomen is dark greenish.

Distribution and habitat The species occurs in south-west Western Australia. The type locality is Mundaring.

Behaviour The adults are flying mellivores.

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