Delphacidae is a family of planthoppers containing about 2000 species, distributed worldwide. Delphacids are separated from other "hoppers" by the prominent spur on the tibia of the hindleg.

Diet and pest species: All species are phytophagous, many occurring on various grasses. Some species are significant pests and important vectors for cereal pathogens; for example:

• The rice brown planthopper, Nilaparvata lugens (Stål)
• The white-backed planthopper (rice), Sogatella furcifera (Horváth, 1899)
• The sugarcane planthopper, Perkinsiella saccharicida Kirkaldy, 1903

Subfamilies, tribes and selected genera: Fulgoromorpha Lists On the Web includes the following tribes and genera (complete lists where tribe unassigned):

Asiracinae: Auth.: Motschulsky, 1863

• Tribe Asiracini Motschulsky, 1863
• Tribe Eodelphacini Emeljanov, 1995
• Tribe Idiosystatini Emeljanov, 1995
• Tribe Neopunanini Emeljanov, 1995
• Tribe Platysystatini Emeljanov, 1995
• Tribe Tetrasteirini Emeljanov, 1995
• Tribe Ugyopini Fennah, 1979

Delphacinae: Auth.: Leach, 1815 - world-wide, selected genera:

• Tribe Delphacini Leach, 1815
• Aloha Kirkaldy, 1904
• Criomorphus Curtis, 1833
• Delphacinus Fieber, 1866
• Delphacodes Fieber, 1866 (synonym Delphax Latreille, 1807)
• Javesella Fennah, 1963
• Kakuna Matsumura, 1935
• Megamelus Fieber, 1866
• Metadelphax Wagner, 1963
• Muellerianella Wagner, 1963
• Muirodelphax Wagner, 1963
• Nilaparvata Distant, 1906
• Nothodelphax Fennah, 1963
• Paraliburnia Jensen-Haarup, 1917
• Prokelisia Osborn, 1905
• Pseudaraeopus Kirkaldy, 1904 (synonym Delphacodes Melichar, 1901) - southern Europe
• # Pseudaraeopus dalmatinus
• # Pseudaraeopus lethierryi
• # Pseudaraeopus sacchari
• Sogatella Fennah, 1956
• Toya Distant, 1906
• Xanthodelphax Wagner, 1963
• Tribe Saccharosydnini Vilbaste, 1968
• Lacertinella (Remes Lenicov & Rossi Batiz) 2011
• Neomalaxa Muir, 1918
• Pseudomacrocorupha Muir, 1930
• Saccharosydne Kirkaldy, 1907
• Tribe Tropidocephalini Muir, 1915
• Tropidocephala Stål, 1853

Kelisiinae: Auth.: Wagner, 1963

• Anakelisia Wagner, 1963
• Kelisia Fieber, 1866

Plesiodelphacinae: Auth.: Asche, 1985 - neotropical

• Burnilia Muir & Giffard, 1924
• Plesiodelphax Asche, 1985

Stenocraninae: Auth.: Wagner, 1963

• Embolophora Stål, 1853
• Frameus Bartlett, 2010
• Kelisicranus Bartlett, 2006
• Obtusicranus Bartlett, 2006
• Preterkelisia Yang, 1989
• Proterosydne Kirkaldy, 1907
• Stenocranus Fieber, 1866 - type genus
• Stenokelisia Ribaut, 1934
• Tanycranus Bartlett, 2010
• Terauchiana Matsumura, 1915

Vizcayinae: Auth.: Asche, 1990 – SE Asia

• Neovizcaya Liang, 2002
• Vizcaya Muir, 1917 - type genus

Subfamily not placed: 

• †Amagua Cockerell, 1924
• Epunka Matsumura, 1935
• Eunycheuma Yang, 1989
• Hikona Matsumura, 1935
• Jugodina Schumacher, 1915
• Lauriana Ren & Qin, 2014
• Megamelodes Le Quesne, 1960
• Nephropsia Costa, 1862
• Sogatodes Fennah, 1963
• Unkana Matsumura, 1935