Leioproctus similis, or Leioproctus (Colletellus) similis, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by entomologist Remko Leijs in 2018.
Etymology The specific epithet similis refers to the common habitus of the species within the subgenus.
Description The female holotype body length is 5.8 mm, head width 2 mm. Integumental colouration is mainly black, brown and orange. The hair is brown.
Distribution and habitat The species occurs in southern inland Western Australia. The type locality is Mount Gibson Station in the eastern Avon Wheatbelt bioregion.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Borya species.
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