• Chlamydomonas Ehrenberg, 1833
• Chlamydomonas abbreviata Skvortsov, 1957
• Chlamydomonas aboviformis H.J.Hu & Y.X.Wei, 2009
• Chlamydomonas acidophila Negoro, 1944
• Chlamydomonas acidophila Nygaard, 1945 accepted as Chlamydomonas nygaardii Fott, 1964
• Chlamydomonas acies H.Ettl, 1965
• Chlamydomonas actinochloris Deason & Bold, 1960 accepted as Chloromonas actinochloris Pröschold, B.Marin, U.W.Schlösser & Melkonian, 2001
• Chlamydomonas actinosphaerii Skuja, 1964 accepted as Cystomonas actinosphaerii (Skuja) Ettl & Gaertner, 1987
• Chlamydomonas aculeata (Pascher) Korshikov ex H.Ettl, 1976 accepted as Chlorogonium elongatum var. aculeatum (Pascher) L.Péterfi, 1968
• Chlamydomonas acuminata Skuja, 1956 accepted as Chloromonas acuminata (Skuja) Gerloff & Ettl, 1970
• Chlamydomonas acuta Korshikov, 1927
• Chlamydomonas acutata Korshikov, 1927
• Chlamydomonas acuteovalis Huber-Pestalozzi (uncertain)
• Chlamydomonas acutiformis Pascher & Jahoda, 1928
• Chlamydomonas acutiformis var. saliceaensis L.S.Péterfi, 1968
• Chlamydomonas acutissima Pascher, 1932
• Chlamydomonas adhaerens Matvienko, 1938 accepted as Chloromonas adhaerens (Matvienko) Gerloff & H.Ettl, 1970
• Chlamydomonas adriatica J.Schiller, 1926 accepted as
• Chlamydomonas aequabilis Skuja, 1964 accepted as Gloeomonas aequabilis (Skuja) H.Ettl, 1970
• Chlamydomonas aestivata Skvortsov, 1957 (uncertain)
• Chlamydomonas agametos (F.Moewus) Kuhn & Irm.Löw (uncertain)
• Chlamydomonas aggregata Deason & Bold, 1960
• Chlamydomonas agloëformis Pascher, 1927
• Chlamydomonas akinetos Deason & Bold, 1960
• Chlamydomonas alaskensis Skuja, 1969 accepted as Chloromonas alaskensis (Skuja) H.Ettl, 1979
• Chlamydomonas alata Cohn, 1878
• Chlamydomonas alatapapilla J.Schiller, 1954
• Chlamydomonas alkalinophila H.J.Hu & L.M.Luo, 2002
• Chlamydomonas allensworthii R.C.Starr, F.Marner & Jaenicke, 1995
• Chlamydomonas allorgei Bourrelly, 1961 accepted as Chloromonas allorgei (Bourrelly) Gerloff & Ettl, 1970
• Chlamydomonas alpina (Wille) Playfair, 1918 accepted as Chloromonas alpina Wille, 1903
• Chlamydomonas alpina var. extensa J.Schiller (uncertain)
• Chlamydomonas altera Skuja, 1956
• Chlamydomonas alveolata Pascher accepted as Chloromonas alveolata (Pascher) Gerloff & Ettl, 1970
• Chlamydomonas ambigua Gerloff, 1940
• Chlamydomonas ambigua var. minor L.S.Péterfi, 1968 (uncertain)
• Chlamydomonas ametastatos F.Moewus, 1931
• Chlamydomonas ametastatos var. major H.J.Hu & M.Yang, 2009
• Chlamydomonas amici-mei H.Ettl, 1976
• Chlamydomonas amoena Huber-Pestalozzi, 1961 accepted as Chlamydomonas skvortzovi H.Ettl & O.Ettl, 1959
• Chlamydomonas ampla Printz, 1916 accepted as Sphaerellopsis ampla (Printz) Gerloff, 1940
• Chlamydomonas amplissima Kufferath (uncertain)
• Chlamydomonas ampulla Skvortsov, 1957 (uncertain)
• Chlamydomonas anglica (G.S.West) Pascher, 1927 (uncertain)
• Chlamydomonas angulosa O.Dill, 1895
• Chlamydomonas angulosa var. obesa Playfair
• Chlamydomonas angusta (Dujardin, 1841) Diesing, 1850 (uncertain)
• Chlamydomonas angustissima H.Ettl, 1958 accepted as Chloromonas angustissima (Ettl) Gerloff & Ettl, 1970
• Chlamydomonas annulata Nygaard, 1949
• Chlamydomonas antarctica Wille, 1911 accepted as Chlorosarcina antarctica (Wille) H.U.Ling, 2002
• Chlamydomonas anticontata J.Schiller, 1952
• Chlamydomonas anticontata var. perforata H.Ettl, 1965
• Chlamydomonas anuraeae Korshikov
• Chlamydomonas aperta S.Chen & H.J.Hu, 2002
• Chlamydomonas apex Pascher, 1927 accepted as Chloromonas apex (Pascher) Gerloff & Ettl, 1970
• Chlamydomonas apiangulata H.J.Hu, 2009
• Chlamydomonas apicala Skvortsov, 1957
• Chlamydomonas apiculata Pascher, 1927
• Chlamydomonas apiocystiformis Artari, 1892 accepted as Chlorophysema apiocystiforme (A.P.Artari) Pascher, 1927
• Chlamydomonas appendiculata Deason & Bold, 1960
• Chlamydomonas applanata Pringsheim, 1930
• Chlamydomonas applanata var. acidophila Fott accepted as Chlamydomonas applanata Pringsheim, 1930
• Chlamydomonas arachne Pascher, 1930
• Chlamydomonas archibaldiae Uhlik & Bold, 1970
• Chlamydomonas arctoalpina Skuja, 1964
• Chlamydomonas areolata Skvortsov, 1957 (uncertain)
• Chlamydomonas armata Skvortsov, 1957
• Chlamydomonas asiatica Skvortsov, 1932
• Chlamydomonas aster H.Ettl, 1979 accepted as Chlamydomonas chlorastera H.Ettl, 1968
• Chlamydomonas asterosperma Lagerheim, 1892
• Chlamydomonas astigmata J.W.G.Lund, 1947 accepted as Chlamydomonas lundii H.Ettl & O.Ettl, 1959
• Chlamydomonas astigmata M.W.Spargo, 1913
• Chlamydomonas asymmetrica Korshikov, 1927
• Chlamydomonas asymmetrica var. gallica Bourrelly, 1951 (uncertain)
• Chlamydomonas asymmetrica var. minima P.Bourrelly
• Chlamydomonas asymmetrica var. triangularis H.Ettll, 1965 (uncertain)
• Chlamydomonas atactogama Korshikov, 1927 accepted as Chlamydomonas debaryana var. atactogama (Korshikov) Gerloff, 1940
• Chlamydomonas atactogama var. ceylanica E.C.T.Holsinger (uncertain)
• Chlamydomonas attenuata Pascher, 1927 accepted as Chloromonas attenuata (Pascher) Korschikov ex Ettl, 1970
• Chlamydomonas augustae Skuja, 1943 accepted as Chloromonas augustae (Skuja) Pröschold, B.Marin, U.W.Schlösser & Melkonian, 2001
• Chlamydomonas augustae f. planctonica Ettl, 1965 accepted as Chlamydomonas augustae var. planctonica (Ettl) Ettl, 1973
• Chlamydomonas augustae var. ellipsoidea Shin Watanabe
• Chlamydomonas augustae var. eupapillata Ettl, 1973
• Chlamydomonas augustae var. planctonica (Ettl) Ettl, 1973
• Chlamydomonas aulata Pascher, 1927 accepted as Sphaerellopsis aulata (Pascher) Gerloff, 1940 accepted as Vitreochlamys aulata (Pascher) Bako, 1970
• Chlamydomonas autumnalis Skuja, 1948 accepted as Gloeomonas autumnalis (Skuja) H.Ettl & O.Ettl, 1959
• Chlamydomonas bacca Ettl, 1965
• Chlamydomonas baccata Skvortsov, 1957
• Chlamydomonas bacillaris R.Grandori & L.Grandori, 1934
• Chlamydomonas bacillus Pascher & R.Jahoda, 1928
• Chlamydomonas badensis F.Moewus, 1931
• Chlamydomonas badensis Moewus, 1931
• Chlamydomonas badensis var. major G.Nygaard (uncertain)
• Chlamydomonas ballenyana Kol, 1968
• Chlamydomonas ballenyana var. minor Kol, 1971
• Chlamydomonas basimaculata Pascher & Jahoda, 1928
• Chlamydomonas basistellata Pascher, 1927
• Chlamydomonas basistellata var. stigmata H.Jakubiec
• Chlamydomonas basistigmata F.Moewus, 1931 accepted as Chloromonas basistigmata (Moewus) Gerloff, 1970
• Chlamydomonas bella Pascher, 1932