- Hypseloecus megistus G.Q. Liu & X. Zhang, 2011
- Hypseloecus takahashii Yasunaga, 2001
- Hypseloecus tamaricis (Linnavuori, 1975)
- Hypseloecus visci (Puton, 1888)
- Hypselopus gigas Burmeister, 1835
- Hypselosoma boops McAtee & Malloch, 1925
- Hypselosoma hirashimai Esaki & Miyamoto, 1959
- Hypselosoma matsumurae Horváth, 1905
- Hypsitylus arberlaitz Pagola-Carte, 2006
- Hypsitylus prasinus Fieber, 1861
- Hyrcanus capitatus Distant, 1911
- Hyrcanus chenae Zettel, 1998
- Hyrcanus draculus Zettel, 1998
- Iberolygus rubrostriatus (Wagner, 1971)
- Icodema breviceps (Wagner, 1968)
- Icodema infuscata (Fieber, 1861)
- Icus angularis Fieber, 1861
- Icus viberti Horváth, 1907
- Idiocysta takarai Souma, 2020
- Idiotrephes hainanensis Papáček & Zettel, 2000
- Idolocoris Douglas & Scott, 1865
- Ildefonsus distanti C.R. Li & L.Y. Zheng, 2006
- Ildefonsus nexus Drake & Ruhoff, 1961
- Ildefonsus provorsus Distant, 1911
- Ilyocoris cimicoides (Linnaeus, 1758)
- Ilyocoris cimicoides cimicoides (Linnaeus, 1758)
- Ilyocoris cimicoides exclamationis (Scott, 1874)
- Ilyocoris cimicoides jonicus (Lindberg, 1922)
- Inara alboguttata Stål, 1863
- Indatractus pantherinus Linnavuori, 1975
- Indatractus robustus Linnavuori, 1986
- Indonectella Hutchinson, 1940
- Iocoris nodulifemoralis P. Zhao, Z.H. Luo & Cai, 2009
- Iodinus ferrugineus Lindberg, 1927
- Iphiarusa compacta (Distant, 1887)
- Iphiarusa longicauda Hsiao & Cheng, 1977
- Iphicrates gressitti J.A. Slater, 1966
- Iphicrates hainanensis Zheng & Zou, 1981
- Iphicrates spinicaput (Scott, 1874)
- Iphicrates weni Zheng, 1986
- Iphita limbata Stål, 1870
- Iralunelus gallicus (Štys, 1974)
- Irantha nigrina W. Chen, P. Zhao & Cai, 2005
- Irbisia sericans (Stål, 1858)
- Irochrotus caspius Jakovlev, 1875
- Irochrotus caucasicus Jakovlev, 1876
- Irochrotus excisus Reuter, 1900
- Irochrotus lanatus (Pallas, 1773)
- Irochrotus lobatus L.Y. Zheng & G.Q. Liu, 1987
- Irochrotus maculiventris (Germar, 1839)