Leioproctus rejectus, or Leioproctus (Colletellus) rejectus, 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 1905.

Distribution and habitat The species occurs in south-west Western Australia. Type localities include Perth and Dryandra.

Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Caladenia species.

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