Systena is a genus of flea beetles in the family Chrysomelidae. There are about 90 described species, found in the New World, mostly in the Neotropics.

Selected species: 

• Systena bitaeniata (J. L. LeConte, 1859)
• Systena blanda F. E. Melsheimer, 1847 (palestriped flea beetle)
• Systena californica Blake, 1935
• Systena carri Blake, 1935
• Systena collaris Crotch, 1873
• Systena corni Schaeffer, 1932 (dogwood systena)
• Systena dimorpha Blake, 1933
• Systena elongata (Fabricius, 1798) (elongate flea beetle)
• Systena frontalis (Fabricius, 1801) (red-headed flea beetle)
• Systena gracilenta Blake, 1933
• Systena hudsonias (Forster, 1771) (black-headed flea beetle)
• Systena laevis Blake, 1935
• Systena laurentia Bechyné, 1955
• Systena lherminieri Bryant, 1942
• Systena marginalis (Illiger, 1807) (margined systena)
• Systena mitis (J. L. LeConte, 1858)
• Systena pallicornis Schaeffer, 1906
• Systena pallipes Schwarz, 1878
• Systena plicata Blatchley, 1921
• Systena sexnotata Fall, 1910
• Systena s-littera (Linnaeus, 1758)
• Systena variata Schaeffer, 1932