Leioproctus wanni, or Leioproctus (Goniocolletes) wanni, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by entomologists Remko Leijs and Katja Hogendoorn in 2016.

Etymology The specific epithet wanni honours Stan Wann.

Description The male holotype body length is 12 mm, head width 3.3 mm; the female paratype body length is 13 mm, head width 3.8 mm. Integumental colouration is mainly black, orange and brown. The hair is white and orange.

Distribution and habitat The species occurs in inland southern Australia. Type localities include Hiltaba Station in the Gawler Ranges of South Australia, and a site south of Salmon Gums, Western Australia.

Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Eucalyptus, Melaleuca and Myoporum species.

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