• Dobatia Nordsieck, 1973
• Labathia Fairmaire, 1898 (uncertain)
• Labatia O. Swartz, 1788 [Family: Sapotaceae]
• Labatia Scopoli, 1777 (unaccepted) [Family: Celastraceae]
• Leratia Patouillard, 1907 accepted as Leratiomyces Bresinsky & Binder, 1998 accepted as Leratiomyces Bresinsky & M. Binder, 1998 ex P.D. Bridge, B.M. Spooner, R.E. Beever & D.C. Park, 2008 [Family: Strophariaceae]
• Leratia V.F. Brotherus & Paris in V.F. Brotherus, 1909 [Family: Orthotrichaceae]
• Le-Ratia Patouillard, 1907 ex Saccardo & Trotter, 1912 accepted as Leratiomyces Bresinsky & Binder, 1998 accepted as Leratiomyces Bresinsky & M. Binder, 1998 ex P.D. Bridge, B.M. Spooner, R.E. Beever & D.C. Park, 2008
• Libitia Simon, 1879
• Limatia Schallreuter, 1991 †
• Lipatia Busck, 1911 (uncertain)
• Lnuatia Spriestersbach, 1919 † accepted as Lunatia Gray, 1847 accepted as Euspira Agassiz in J. Sowerby, 1837
• Lobaca Vezda, 1983 accepted as Fellhanera A. Vezda, 1986
• Lobactis Verrill, 1864
• Lobaria (J.C.D. Schreber) G.F. Hoffmann, 1796 [Family: Lobariaceae]
• Lobaria A.H. Haworth, 1821 (unaccepted) [Family: Saxifragaceae]
• Lobaria O. F. Müller, 1776 accepted as Philine Ascanius, 1772 [Family: Philinidae]
• Lobaria Schumacher, 1817 accepted as Sanguinolaria Lamarck, 1799 [Family: Psammobiidae]
• Lobarina Nylander ex Crombie, 1894
• Lobata V.J. Chapman, 1952 (uncertain > nomen dubium)
• Lobataria Watson, 2008
• Lobatula Fleming, 1822
• Lobatus Swainson, 1837
• Lobaunia Haase, 1993 (uncertain)
• Lobbia J.E. Planchon, 1847 accepted as Thottea Rottboell, 1783
• Lobeatta Béthoux, 2005 †
• Lobelia Dajoz, 1972 (uncertain) [Family: Coleoptera (awaiting allocation)]
• Lobelia Linnaeus, 1753 [Family: Campanulaceae]
• Lobelia P. Miller, 1754 accepted as Scaevola Linnaeus, 1771 [Family: Goodeniaceae]
• Lobesia Stainton, 1859
• Lobetina Simon, 1895 accepted as Prasonica Simon, 1895
• Lobivia N.L. Britton & J.N. Rose, 1922 accepted as Echinopsis Zuccarini, 1837
• Lobraia (uncertain)
• Lobulia Greer, 1974
• Lomatia (E.M. Fries) P.A. Karsten, 1889 accepted as Cytidia Quélet, 1888 [Family: Corticiaceae]
• Lomatia Meigen, 1822 [Family: Bombyliidae]
• Lomatia R. Brown, 1810 [Family: Proteaceae]
• Lordatia Robineau-Desvoidy, 1830 (uncertain > nomen dubium)
• Loretia Duval-Jouve, 1880 accepted as Vulpia C.C. Gmelin, 1805
• Lortia Rendle, 1898 accepted as Euphorbia Linnaeus, 1753
• Lottia Gray, 1833
• Lunatia Gray, 1847 accepted as Euspira Agassiz in J. Sowerby, 1837
• Lusatia G. Burmann, 1970 †