Lactarius uvidus is a European and North American "milk-cap" mushroom, of which the milk turns violet when the flesh is damaged. The fungi generally identified as L. uvidus are part of a complex of closely related species and varieties which are difficult to delimit definitively, . It gives its name to the section Uvidi within the genus Lactarius. It is generally thought to be poisonous (but Moser classifies it as edible with reservations).