Plesiomma is a genus of robber flies in the family Asilidae. There are at least 20 described species in Plesiomma.

Species: These 20 species belong to the genus Plesiomma:

• Plesiomma angustum Macquart, 1848
• Plesiomma atrum Bromley, 1929
• Plesiomma caedens (Wiedemann, 1828)
• Plesiomma caminarium (Wiedemann, 1828)
• Plesiomma darlingtoni Hull
• Plesiomma ferrugineum (Macquart, 1838)
• Plesiomma fuliginosum (Wiedemann, 1821)
• Plesiomma funestum Loew, 1861
• Plesiomma haemorrhoum (Fabricius, 1805)
• Plesiomma indecorum Loew, 1866
• Plesiomma inflatum Hull, 1962
• Plesiomma jungens Schiner, 1867
• Plesiomma leptogastrum Loew, 1866
• Plesiomma lineatum (Fabricius, 1781)
• Plesiomma salti Bromley, 1929
• Plesiomma semirufum (Wiedemann, 1828)
• Plesiomma sepia Hull, 1962
• Plesiomma simile Scarbrough & Perez-Gelabert, 2006
• Plesiomma testaceum Macquart, 1838
• Plesiomma unicolor Loew, 1866