Xanthochilus Stål, 1872, Genus
Xenoborus Reuter, 1908c, Genus – synonym of Tropidosteptes Uhler, 1878, Genus
Xenocoris Fieber, 1858, Genus – synonym of Conostethus Fieber, 1858, Genus
Xenocorixa Hungerford, 1947, Genus
Xenotracheliella Drake & Harris, 1926, Genus – synonym of Elatophilus Reuter, 1884, Genus
Xerophagius Kiritshenko, 1948, Genus – invalid name of Paranysius Horváth, 1895, Genus
Xiphovelia Lundblad, 1933, Genus
Xiphoveloidea Hoberlandt, 1951, Genus
Xylocoridea Reuter, 1876, Genus