Cortinarius iodes, commonly known as the spotted cort or the viscid violet cort, is a species of agaric fungus in the family Cortinariaceae. The fruit bodies have small, slimy caps which are up to 6 cm (2+1⁄4 in) in diameter and purple, developing yellowish spots and streaks in maturity. The gill color changes from violet to rusty or grayish brown as the inedible mushroom matures. There are several similar species, such as C. iodeoides, which can be distinguished by its bitter-tasting cap cuticle.

C. iodes grows on the ground in a mycorrhizal association with deciduous trees in the Americas and northern Asia.

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