Leioproctus nudiventris, or Leioproctus (Leioproctus) nudiventris, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by entomologist Michael Batley in 2025.
Etymology The specific epithet nudiventris (Latin: "bare-bellied") is an anatomical reference to "the polished surface of metasomal S6 of the male".
Description The holotype male body length is 7.6 mm, head width 2.4 mm. Integumental colouration is mainly black with brown markings. The hair is mostly white.
Distribution and habitat The species occurs in eastern inland Australia. The type locality is Ledknapper Nature Reserve, near Enngonia in north-western New South Wales.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Acacia triptera and Micromyrtus hexamera, as well as Calotis and Solanum species.
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