| Kaha Kirkaldy, 1906 (Derbidae) | Kibofascius Van Stalle, 1986 (Cixiidae) |
| Kakuna Matsumura, 1935 (Delphacidae) | Kinabenna Hoch, 2013 (Cixiidae) |
| Kalidasa Kirkaldy, 1900 (Fulgoridae) | Kinnacana Remane, 1985 (Kinnaridae) |
| Kallitambinia Muir, 1931 (Tropiduchidae) | Kinnapotiguara Xing, Hoch & Chen, 2013 (Kinnaridae) |
| Kallitaxila Kirkaldy, 1901 (Tropiduchidae) | Kinnara Distant, 1906 (Kinnaridae) |
| Kaltanoscyta† Becker-Migdisova, 1960 (Coleoscytidae†) | Kinnarocixius† Hamilton, 1990 (Lalacidae†) |
| Kamabrachys Constant, 2023 (Eurybrachidae) | Kinnoccia Remane, 1985 (Kinnaridae) |
| Kamendaka Distant, 1906 (Derbidae) | Kiomonia Schmidt, 1911 (Nogodinidae) |
| Kampulokara Muir, 1913 (Derbidae) | Kirbyana Distant, 1906 (Cixiidae) |
| Kardopocephalus Metcalf, 1938 (Achilidae) | Kirkaldybrachys Constant, 2006 (Eurybrachidae) |
| Karebodopoides† Szwedo, 2001 (Cixiidae) | Kirkamflata Swierczewski, Malenovsky & Stroinski, 2014 (Flatidae) |
| Karesmina† Lambkin, 2020 (Surijokocixiidae†) | Kirongoziella Schmidt, 1924 (Tropiduchidae) |
| Karrama Medler, 1988 (Flatidae) | Kivupterum Dlabola, 1985 (Issidae) |
| Kartalia Koçak, 1981 (Delphacidae) | Klapperibrachys Constant, 2006 (Eurybrachidae) |
| Kasserota Distant, 1906 (Lophopidae) | Klugga† Szwedo, 2019 (Cixiidae) |
| Katbergella Fennah, 1950 (Achilidae) | Kodaiana Distant, 1916 (Issidae) |
| Kathleenum Gnezdilov, 2004 (Issidae) | Kodaianella Fennah, 1956 (Issidae) |
| Katlasus† Luo, Jiang & Szwedo, 2020 (Katlasidae) | Kodaianellissus Wang, Bourgoin & Zhang, 2017 (Issidae) |
| Katoma Baker, 1925 (Lophopidae) | Koghisia Bourgoin, 1997 (Meenoplidae) |
| Katonella Schmidt, 1911 (Issidae) | Koloptera Metcalf, 1938 (Achilidae) |
| Kawanda Fennah, 1950 (Achilidae) | Kommanosyne† Szwedo, 2019 (Cixiidae) |
| Kawandella Synave, 1959 (Achilidae) | Komnixta† Szwedo, 2019 (Cixiidae) |
| Kayania Distant, 1910 (Flatidae) | Komsitija† Szwedo, 2019 (Cixiidae) |
| Kazachicesa Koçak & Kemal, 2010 (Delphacidae) | Kormus Fieber, 1866 (Delphacidae) |
| Kazerunia Dlabola, 1974 (Tropiduchidae) | Koroana Myers, 1924 (Cixiidae) |
| Kazukuru Stroinski, 2021 (Ricaniidae) | Kosalya Distant, 1906 (Achilidae) |
| Keirophettus† Szwedo, 2019 (Tropiduchidae) | Kosswigianella Wagner, 1963 (Delphacidae) |
| Keiserana Synave, 1966 (Ricaniidae) | Kotonisia Matsumura, 1938 (Cixiidae) |
| Kelisia Fieber, 1866 (Delphacidae) | Kovacsiana Synave, 1956 (Issidae) |
| Kelisicranus Bartlett, 2006 (Delphacidae) | Kruegeria Schmidt, 1911 (Ricaniidae) |
| Kelisoidea Beamer, 1950 (Delphacidae) | Krundia† Szwedo, 2019 (Tropiduchidae) |
| Kelyflata Swierczewski & Stroinski, 2019 (Flatidae) | Kubilaya Koçak & Kemal, 2010 (Derbidae) |
| Kempiana Muir, 1922 (Achilidae) | Kulickamia† Gebicki & Szwedo, 2000 (Cixiidae) |
| Kermesia Melichar, 1903 (Meenoplidae) | Kumlika Oshanin, 1913 (Dictyopharidae) |
| Kernastiridius† Szwedo, 2019 (Cixiidae) | Kuranda Distant, 1907 (Derbidae) |
| Kervillea de Bergevin, 1918 (Issidae) | Kurandella Fennah, 1950 (Achilidae) |
| Kesaflata Stroinski, Malenovsky & Swierczewski, 2016 (Flatidae) | Kusnezoviella Vilbaste, 1965 (Delphacidae) |
| Ketumala Distant, 1906 (Flatidae) | Kutariana Nast, 1950 (Fulgoridae) |
| Keyflana Beamer, 1950 (Delphacidae) | Kuvera Distant, 1906 (Cixiidae) |
| Kiambrama Donaldson, 1988 (Delphacidae) |
