• Leptaulus Bentham in Bentham & J.D. Hooker, 1862
• Leptobelus Stål, 1866 (uncertain) [Family: Hemiptera (awaiting allocation)]
• Leptobelus Zimmerman, 1994 accepted as Stenobelus Zimmerman in Alonso-Zarazaga & Lyal, 1999 [Family: Belidae]
• Leptobolus Hall, 1872 † [Family: Obolidae]
• Leptobolus Kirby, 1891 (unaccepted) [Family: Hemiptera (awaiting allocation)]
• Leptochilus Cossmann, 1909 † (unaccepted) [Family: Mollusca (awaiting allocation)]
• Leptochilus Kaulfuss, 1824 [Family: Polypodiaceae]
• Leptochilus Loew, 1872 accepted as Epacmus Osten-Sacken, 1887 [Family: Bombyliidae]
• Leptochilus Saussure, 1853 [Family: Vespidae]
• Leptocilus (uncertain)
• Leptocyclus Agassiz, 1846 accepted as Cycleptus Rafinesque, 1819
• Leptohyalis accepted as Leptohalysis Loeblich & Tappan, 1984 †
• Leptoiulus Verhoeff, 1894
• Leptolycus Leng & Mutchler, 1922
• Leptomelus Jakovlev, 1882 (uncertain)
• Leptomylus Cope, 1869 † (uncertain)
• Leptophilus Chamberlin, 1915 accepted as Polycricus Saussure & Humbert, 1872
• Leptophycus A. Fritsch, 1908 † [Phylum: Algae incertae sedis]
• Leptophycus J.H. Johnson, 1940 † accepted as Cyanoleptophycus E.A. Molinari-Novoa & M.D. Guiry, 2021 † [Phylum: Cyanobacteria]
• Leptophycus K.B. Korde, 1954 † accepted as Palaeoleptophycus K.B. Korde, 1958 † [Phylum: Cyanobacteria]
• Leptophyllus Hope, 1842 accepted as Oxynopterus Hope, 1842 [Family: Elateridae]
• Leptophyllus J. Cachon & M. Cachon-Enjumet, 1964 accepted as Abedinium A.R. Loeblich Jr. & A.R. Loeblich III, 1966 [Family: Leptodiscaceae]
• Leptophyllus Quenstedt, 1876 (uncertain) [Family: Porifera (awaiting allocation)]
• Leptophytus Cassini, 1817 (uncertain)
• Leptopilus Raymond, 1924 †
• Leptopygus Förster, 1868 (uncertain)
• Leptopylus Ashmead, 1900 (unaccepted)
• Leptostylus Faust, 1892 accepted as Litostylus Faust, 1893 [Family: Curculionidae]
• Leptostylus Fischel, 1927 accepted as Leptofischelia Strand, 1929 accepted as Trichopelma Simon, 1888 [Family: Theraphosidae]
• Leptostylus Leconte, 1852 [Family: Cerambycidae]
• Leptotylus Van Duzee, 1916 (uncertain)
• Leptotyrus Jeannel, 1954 accepted as Acylotyrus Jeannel, 1954
• Leptoxylum Corda, 1845 † (uncertain)