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 splendens refers to the smooth and shiny integument on the metapostnotum and terga.
Description The female holotype body length is 4.5 mm, head width 1.5 mm. Integumental colouration is mainly black, brown and orange. The hair is brown.
Distribution and habitat The species occurs in Western Australia. The type locality is 14 km south-east of Tamala Station, Shark Bay.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Calandrinia species.
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