Leioproctus megadontus, or Leioproctus (Charicolletes) megadontus, 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 1913.

Description Female body length is about 10 mm. Colouration is mainly steel-blue with greenish tints.

Distribution and habitat The species occurs in coastal south-eastern Queensland, including offshore islands. The type locality is Caloundra.

Behaviour The adults are flying mellivores.

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