• Codium Enderlein, 1936 (uncertain) [Family: Diptera (awaiting allocation)]
• Codium Stackhouse, 1797 [Family: Codiaceae]
• Codium acuminatum O. Schmidt, 1923
• Codium adhaerens C. Agardh, 1822
• Codium afaqhusainii M. Nizamuddin, 2001
• Codium aliyae M. Nizamuddin
• Codium amphibium Moore accepted as Codium fragile (Suringar) Hariot, 1889
• Codium amplivesiculatum Setchell & N.L. Gardner, 1924
• Codium anastomosans Setchell & N.L. Gardner, 1924
• Codium apiculatum P.C. Silva, M.E. Chacana & H.B. S Womersley, 2012
• Codium arabicum Kützing, 1856
• Codium arenicola P.C. Silva & M.E. Chacana, 2003
• Codium atlanticum (A.D. Cotton) De Valéra, 1939 accepted as Codium fragile (Suringar) Hariot, 1889
• Codium australicum P.C. Silva, 1956
• Codium barbatum Okamura, 1930
• Codium bartlettii C.K. Tseng & W.J. Gilbert, 1942
• Codium bilobum M. Nizamuddin
• Codium boergesenii M. Nizamuddin, 2001
• Codium brandegeei Setchell & N.L. Gardner, 1924
• Codium bulbopilum Setchell, 1924
• Codium bursa (Olivi) C. Agardh, 1817
• Codium campanulatum P.C. Silva & M.E. Chacana, 2004
• Codium capitatum P.C. Silva, 1959
• Codium capitulatum P.C. Silva & Womersley, 1956
• Codium carolinanum Searles
• Codium carolinianum Searles, 1972
• Codium cattaniae Vouk, 1936
• Codium cerebriforme Setchell, 1937
• Codium cervicorne Setchell & N.L. Gardner, 1924
• Codium chazaliei Weber-van Bosse
• Codium cicatrix P.C. Silva, 1959
• Codium claviforme (Roth) Delle Chiaje accepted as Dasycladus vermicularis (Scopoli) Krasser, 1898
• Codium clypiatum J.G. Agardh
• Codium coactum Okamura, 1902
• Codium coarctatum Okamura, 1915 accepted as Codium coactum Okamura, 1902
• Codium compressum Biasoletto
• Codium conjunctum Setchell & N.L. Gardner, 1924
• Codium contractum Kjellman, 1897
• Codium convolutum (Dellow) P.C. Silva, 1962
• Codium coralloides (Kützing) P.C. Silva, 1960
• Codium coronatum Setchell, 1926 accepted as Codium arabicum Kützing, 1856
• Codium cranwelliae Setchell, 1940
• Codium crustaceum Schousboe
• Codium cuneatum Setchell & N.L. Gardner, 1924
• Codium cylindricum Holmes, 1896
• Codium damicorne (Bory) Kützing
• Codium dawsonii P.C. Silva, F.F. Pedroche & M.E. Chacana, 1992
• Codium decorticatum (Woodward) M.A. Howe, 1911
• Codium decumbens Martius, 1833
• Codium desultorium P.C. Silva & M.E. Chacana, 2004
• Codium dichotomum S.F. Gray, 1821
• Codium difforme Kützing, 1843 accepted as Codium effusum (Rafinesque) Delle Chiaje, 1829
• Codium dilatatum (Rafinesque) Delle Chiaje
• Codium dimorphum Svedelius, 1900 accepted as Codium setchellii N.L. Gardner, 1919
• Codium distichium A.C. Brown & N. Jarman
• Codium distichum A.C. Brown & N. Jarman
• Codium divaricatum (C. Agardh) Baisoletto, 1841 accepted as Codium vermilara (Olivi) Delle Chiaje, 1829
• Codium divaricatum A. Gepp & E. Gepp, 1911 accepted as Codium geppiorum O.C. Schmidt, 1923
• Codium divaricatum Holmes, 1896 accepted as Codium subtubulosum Okamura, 1902
• Codium duthiae Silva
• Codium duthieae P.C. Silva, 1956
• Codium dwarkense Børgesen, 1947
• Codium edule P.C. Silva, 1952
• Codium effusum (Rafinesque) Delle Chiaje, 1829
• Codium elisabethae O.C. Schmidt
• Codium elisabethiae O.C. Schmidt, 1929
• Codium elongatum (Turner) C. Agardh, 1823 accepted as Codium decorticatum (Woodward) M.A. Howe, 1911
• Codium extricatum P.C. Silva, 1959
• Codium faridii M. Nizamuddin
• Codium fastigiatum M. Nizamuddin, 2001
• Codium fernandezianum Setchell, 1937
• Codium filiforme Montagne
• Codium fimbriatum M. Nizamuddin
• Codium flabellatum P.C. Silva ex M. Nizamuddin, 2001
• Codium flabelliforme (Desfontaines) C. Agardh, 1823
• Codium flagellare Agardh
• Codium formosanum Yamada, 1950
• Codium foveolatum M.A. Howe, 1914
• Codium fragile (Suringar) Hariot, 1889
• Codium galeatum J.G. Agardh, 1887
• Codium geppii O.C. Schmidt
• Codium geppiorum O.C. Schmidt, 1923
• Codium gerloffii M. Nizamuddin
• Codium giraffa P.C. Silva, 1979
• Codium globosum A.H.S. Lucas, 1927
• Codium gongylocephalum Kraft, 2007
• Codium gracile (O.C. Schmidt) Dellow, 1952
• Codium guineense P.C. Silva
• Codium guineënse P.C. Silva ex G.W. Lawson & D.M. John, 1982
• Codium harveyanum Stechell
• Codium harveyi P.C. Silva, 1956
• Codium hawaiiense P.C. Silva & M.E. Chacana, 2004
• Codium hawkesbayense M. Nizamuddin, 2001
• Codium hubbsii E.Y. Dawson, 1950
• Codium implicatum (C. Agardh) Biasoletto
• Codium incognitum P.C. Silva, 1959
• Codium indicum S.C. Dixit, 1940
• Codium inerme P.C. Silva, 2004
• Codium intermedium P.C. Silva & M.E. Chacana, 2004
• Codium intertextum F.S. Collins & Hervey, 1917