Lusius is a genus of parasitoid wasps in the tribe Phaeogenini <small> Förster, 1869</small> or Alomyini <small>Förster, 1869</small>, first described by Pierre Jules Tosquinet in 1903, published after his death. The genus is similar in appearance to species in the genus Heterischnus'. Lusius occurs in the Oriental, Afrotropical, Neotropical and Australasian biogeographical regions.