Trichocolletes grandis is a species of bee in the family Colletidae and the subfamily Colletinae. It is endemic to Australia. It was described in 2012 by Australian entomologists Michael Batley and Terry Houston.
Etymology The specific epithet grandis refers to the species' relatively large size.
Description The body length is about 13–14 mm. The eyes are hairy. Colouration is mainly black, brown and amber, with white and orange hair. The bees have broad silver metasomal bands.
Distribution and habitat The species occurs in arid areas of South Australia and western New South Wales. The type locality is 50 km south-east of Broken Hill.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Swainsona viridis and Swainsona purpurea.
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