Pyrrhalta is a genus of beetles in the leaf beetle family, Chrysomelidae. Species are distributed throughout much of the world, including much of the Northern Hemisphere and the Australian region. The taxonomy of the genus is not clear. Species are separated from those of other genera by the sometimes inconsistent comparison of questionable characters, such as the distribution of minute hairs. There is also little agreement on how to divide the group into subgenera. Former subgenera such as Xanthogaleruca are treated as separate genera by some authors, but not accepted as such by others.