Urocystis occulta is a smut fungus which attacks the leaves and stalks of rye (Secale cereale).

It is found in Australia, Europe,[3] and North America.

The fungus was first described by German botanist Karl Friedrich Wilhelm Wallroth under the name Erysiphe occulta in 1833,[4] before being renamed as Urocystis occulta in 1857 by German botanist and mycologist Gottlob Ludwig Rabenhorst.

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