- Joppeicus paradoxus Puton, 1881
- Jordischidium Dioli, 2012
- Josifovius dimorphus (Wagner, 1961)
- Josifovolygus niger (Josifov, 1992)
- Jugalpada varia (Dallas, 1851)
- Juniperia rubescens Linnavuori, 1965
- Kalama acalyptoides (Golub, 1975)
- Kalama aethiops (Horváth, 1905)
- Kalama aridula (Jakovlev, 1902)
- Kalama beckeri (Jakovlev, 1871)
- Kalama coquereli Puton, 1876
- Kalama coriacea (Asanova, 1970)
- Kalama cretica (Péricart, 1979)
- Kalama froeschneri (Duarte Rodrigues, 1970)
- Kalama fuentei (Puton, 1895)
- Kalama henschi (Puton, 1892)
- Kalama iberica (Horváth, 1905)
- Kalama inermis (Golub, 1975)
- Kalama kiritshenkoi Golub, 2005
- Kalama koreana (Lee, 1967)
- Kalama levantina (Péricart, 1981)
- Kalama lugubris (Fieber, 1861)
- Kalama marqueti (Puton, 1879)
- Kalama montisclari J. Ribes & Pagola-Carte, 2008
- Kalama moralesi (Ribes, 1975)
- Kalama oromii (Ribes, 1978)
- Kalama pusana (Drake & Maa, 1955)
- Kalama putonii (Stål, 1874)
- Kalama reuteri (Horváth, 1906)
- Kalama ribesi (Péricart, 1979)
- Kalama sicardi (Puton, 1894)
- Kalama theryi Montandon, 1897
- Kalama tricornis (Schrank, 1801)
- Kalama vinokurovi (Golub, 1979)
- Kalama wangi Golub, Luo & Vinokurov, 2012
- Kanigara clypeata (Distant, 1903)
- Kanigara flavomarginata Distant, 1906
- Kanigara tuberculata Scudder, 1969
- Karenocoris granulus Hsiao & Ren, 1981
- Karenocoris rudis Hsiao & Ren, 1981
- Karocris morulus V.G. Putshkov, 1975
- Kaschmirocoris klapperichi Hoberlandt, 1984
- Kasumiphylus kyushuensis (Linnavuori, 1961)
- Kasumiphylus ryukyuensis (Yasunaga, 1999)
- Kelidocoris Kolenati, 1845
- Kerzhneroches Kiritshenko & Scudder, 1973
- Kiiorthotylus Yasunaga, 1993
- Kirkaldyia deyrolli (Vuillefroy, 1864)
- Kitocoris hahjima Yasunaga, 2000
- Kitocoris omura Herring, 1967