Mandjelia brassi is a species of mygalomorph spider in the Barychelidae family.

It was described in 1994 by Australian arachnologists Robert Raven and Tracey Churchill.

The specific epithet brassi honours Australian-born American botanist Leonard Brass, who led the 1948 Archbold Expedition to Cape York.

[1][2] The species occurs in Far North Queensland in rainforest habitats.

[1] The type locality is Cape Tribulation in the Daintree National Park.