• Leptocellus Müller, 1944 accepted as Batoscelis Dejean, 1836
• Leptocheilus Till, 1908 † (uncertain)
• Leptocheles M'Coy, 1849 (uncertain) [Family: Crustacea (awaiting allocation)]
• Leptocheles M'Coy, 1853 † (uncertain) [Family: Pisces (awaiting allocation)]
• Leptochelys Bergounioux & Crouzel, 1965 † (uncertain)
• 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]
• Leptochirus Dana, 1849 accepted as Leptocheirus Zaddach, 1844 [Family: Corophiidae]
• Leptochirus Germar, 1824 [Family: Staphylinidae]
• Leptochirus Troschel, 1844 (uncertain) [Family: Echinodermata (awaiting allocation)]
• Leptocilus (uncertain)
• Leptoclypus Koehler, 1922 accepted as Clypeaster Lamarck, 1801
• Leptocyclus Agassiz, 1846 accepted as Cycleptus Rafinesque, 1819
• Leptomylus Cope, 1869 † (uncertain)
• Leptonchulus Chawla, Bhamburkar, Khan & Prasad, 1968 accepted as Meylonema Andrássy, 1960
• 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)
• 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)
• Leucochylus Wenz, 1921 (unaccepted)