 Conus malabaricus Monnier, Limpalaer & Tenorio, 2017 |  Conus malacanus Hwass, 1792 |  Conus maldivus Hwass, 1792 |
 Conus mappa jesusramirezi Cossignani, 2010 |  Conus mappa mappa Lightfoot, 1789 |  Conus mappa sanctaemarthae Vink, 1977 |
 Conus marchionatus Hinds, 1843 |  Conus marckeppensi (Cossignani & Fiadeiro, 2017) |  Conus marcocastellazzii (Cossignani & Fiadeiro, 2014) |
 Conus marcusi Petuch, Berschauer & Poremski, 2016 |  Conus mariaodeteae Petuch & Meyers, 2014 |  Conus marileeae Harasewych, 2014 |
 Conus marimaris (Tenorio, Abalde & Zardoya, 2018) |  Conus marinae Petuch & Myers, 2014 |  Conus marmoreus binhthuanensis Thach, 2023 |
 Conus marmoreus crosseanus Bernardi, 1861 |  Conus marmoreus crosseanus lineata Crosse, 1878 |  Conus marmoreus L., 1758 batard form |
 Conus marmoreus Linnaeus, 1758 |  Conus marmoreus pseudomarmoreus Crosse, 1875 |  Conus marmoreus suffusus Sowerby, 1870 |
 Conus martensi E.A.Smith, 1884 |  Conus mascarenensis (Monnier & Limpalaër, 2019) |  Conus masinoi (Petuch, Berschauer & Poremski, 2016) |
 Conus mauricioi Coltro, 2004 |  Conus maya (Petuch & Sargent, 2011) |  Conus mayaguensis Nowell-Usticke, 1968 |
 Conus mazei Deshayes, 1874 |  Conus mazzolii Petuch & Sargent, 2011 |  Conus mcbridei Lorenz, 2005 |
 Conus mcgintyi Pilsbry, 1955 |  Conus medoci Lorenz, 2004 |  Conus medvedevi (Monteiro, Afonso, Tenorio, Rosado & Pirinhas, 2014) |
 Conus meleus (G. B. Sowerby III, 1913) |  Conus melissae Tenorio, Afonso & Rolán, 2008 |  Conus melvilli Sowerby, 1879 |
 Conus memiae (Habe & Kosuge, 1970) |  Conus memiae adonis Shikama, 1971 |  Conus mercator L., 1758 |
 Conus mercator lamarckii Kiener, 1845 |  Conus mercator orri Ninomiya & da Motta, 1982 |  Conus mercator stimpsonorum T. Cossignani & Allary, 2019 |
 Conus merletti Mayissian, 1974 |  Conus messiasi Rolan & Fernandes, 1990 |  Conus metcalfii cernohorskyi da Motta, 1983 |
 Conus metcalfii Reeve, 1843 |  Conus michelcharlesi (Monnier, Limpalaër & Prugnaud, 2020) |  Conus micropunctatus Rolan & Rockel, 2000 |
 Conus miguelfiaderoi (Cossignani & Fiadeiro, 2015) |  Conus miles Linnaeus, 1758 |  Conus milesi E.A.Smith, 1887 |
 Conus miliaris Hwass, 1792 |  Conus miliaris pascuensis Rehder, 1980 |  Conus milneedwardsi clytospira Melvill & Standen, 1899 |
 Conus milneedwardsi Jousseaume, 1894 |  Conus milneedwardsi lemuriensis Wils & Delsaerdt, 1989 |  Conus minamiae (Lum, 2023) |
 Conus mindanus bermudensis Clench, 1974 |  Conus mindanus Hwass, 1792 |  Conus mindanus karinae Usticke, 1968 |
 Conus mindanus lymani Clench, 1942 |  Conus miniexcelsus Olivera & Biggs, 2010 |  Conus minimus Cossignani & Fiadeiro, 2015 |
 Conus minnamurra (Garrard, 1961) |  Conus miruchae Rockel, Rolan & Monteiro, 1980 |  Conus mitratus Hwass, 1792 |
 Conus moluccensis Kuster, 1838 |  Conus monachus L., 1758 |  Conus moncuri Filmer, 2005 |
 Conus monile Hwass, 1792 |  Conus monilifer (Sowerby, 1833) |  Conus montillai Röckel, 1985 |
 Conus moolenbeeki Filmer, 2011 |  Conus mordeirae Rolan & Trovao, 1990 |  Conus moreleti Crosse, 1858 |
 Conus morrisoni G. Raybaudi Massilia, 1991 |  Conus morroensis Cossignani & Fiadeiro, 2014 |  Conus moylani Delsaerdt, 2000 |
 Conus mozambicus Hwass, 1789 |  Conus mozambicus lautus Reeve, 1844 |  Conus mozambicus macei Crosse, 1865 |
 Conus mpenjatiensis (S. G. Veldsman, 2016) |  Conus mucronatus Reeve, 1843 |  Conus muriculatus Sowerby, 1833 |
 Conus mus Hwass, 1792 |  Conus musicus ceylanicus Hwass, 1792 |  Conus musicus Hwass, 1792 |
 Conus musicus mighelsi Kiener, 1845 |  Conus mustelinus Hwass, 1792 |  Conus mustelinus melinus Shikama, 1964 |