• Acedia Jordan in Jordan & Goss, 1889 accepted as Symphurus Rafinesque, 1810
• Alcadia Gray, 1840
• Alcidia Bourguignat, 1889 (uncertain) [Family: Mollusca (awaiting allocation)]
• Alcidia Monterosato, 1890 accepted as Alvania Risso, 1826 [Family: Rissoidae]
• Alcidia Westwood, 1879 accepted as Alcides Hübner, 1822 [Family: Uraniidae]
• Alcidia Woodworth, 1913 accepted as Euleia Walker, 1835 [Family: Tephritidae]
• Alfaria Emery, 1896 (uncertain)
• Alfieria Giordani Soika, 1934
• Alfkenia Pfankuch, 1906 (uncertain)
• Alfordia M. Black, 1975 † accepted as Ahmuellerella P. Reinhardt, 1964 †
• Alfredia Bezzi, 1918 [Family: Limoniidae]
• Alfredia Cassini in F. Cuvier, 1816 [Family: Asteraceae]
• Alfredina Singh & Kalia, 1972 †
• Alfvenia Larsson, 1983
• Algidia Hogg, 1920
• Allendia Noonan, 1974
• Allodia Winnertz, 1863
• Amedia Jaschhof, 1997
• Antedia Rafinesque, 1814 (unaccepted > nomen nudum)
• Artedia Linnaeus, 1753
• Ascedia Bosc, 1827 accepted as Ascidia Linnaeus, 1767
• Asmedia Pascoe, 1866