Woodlice are eaten by a wide range of insectivores, but the only animals known to prey exclusively on woodlice are spiders of the genus Dysdera, such as the woodlouse spider Dysdera crocata.
Armadillidium vulgare, the (common) pill-bug or (common) pill woodlouse, a widespread woodlouse species found in Europe
Candidatus Rhabdochlamydia porcellionis was identified in the hepatopancreas of the woodlouse Porcellio scaber (Crustacea: Isopoda).