Cortinarius badiolaevis is a fungus in the family Cortinariaceae. The species produces mushrooms with smooth, red-brown caps up to 5 centimetres (2.0 in) in diameter, after which it is named. It has a white stem, and yellow-brown gills. It was first described in 2011, based on specimens collected in the 1990s and 2000s. C. badiolaevis is part of the subgenus Telamonia, but is not part of any known section, and does not have any close relatives within the genus. The rare species is known from Sweden and Spain, where it grows from soil in coniferous woodland.

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