Lepiota brunneoincarnata, also known as the deadly dapperling, is a gilled mushroom of the genus Lepiota in the order Agaricales. It is known to contain amatoxins and consuming this fungus can be a potentially lethal proposition; it was responsible for a fatal poisoning in Spain, and for the deaths of four young members of the same family in Tunisia. It is widely distributed in Europe and temperate regions of Asia. It has white gills and spores. The cap is 1.5–4 cm (0.6–1.6 in) across. The species was described by Swiss botanists Robert Hippolyte Chodat & Charles-Édouard Martin in 1889.