Leioproctus velutinellus, or Leioproctus (Colletellus) velutinellus, 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.

Distribution and habitat The species occurs in Western Australia. The type locality is Kojarena, near Geraldton.

Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Stylidium bulbiferum and Boronia species.

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