Leioproctus nasutus, or Leioproctus (Leioproctus) nasutus, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by Australian entomologist Terry Houston in 1990.
Etymology The specific epithet nasutus (Latin: "with a snout") is an anatomical reference to the strongly protruding clypeus.
Description The male holotype body length is about 10 mm, head width 2.65 mm; female paratype body length 10 mm, head width 2.9 mm. Integumental colouration is mainly black; the hair is mainly white.
Distribution and habitat The species occurs in southern inland Australia. The type locality is Meleya Well on Thundelarra conservation reserve in the Yalgoo bioregion of Western Australia.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Eremophila pantonii, Eremophila longifolia and Scaevola spinescens.
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