Leioproctus platyceratus, or Leioproctus (Leioproctus) platyceratus, 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 platyceratus (Latin: "flat-horned") is an anatomical reference to "the labial palpus of the male which has a broad, flat proximal segment".
Description The holotype male body length is 6.5 mm, head width 2.0 mm; female body length 7.6 mm, head width 2.4 mm. Integumental colouration is mainly black with brown markings. The hair is pale gold to dark brown.
Distribution and habitat The species occurs in eastern New South Wales. The type locality is Commodore Heights, Ku-ring-gai Chase National Park, Sydney.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Boronia ledifolia and Grevillea sericea.
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