Conus olgiatii (L. Bozzetti, 2007)
Chelyconus olivaeformis (FOSSIL) Hoernes & Auinger, 1879 †
Conilithes oliveri (FOSSIL) (J. Marwick, 1931 †)
Atlanticonus olssoni (FOSSIL) (C.J. Maury, 1917 †)
Darioconus omaria (C.H. Hwassin J.G. Bruguière, 1792)
Conus oniscus (FOSSIL) W.P. Woodring, 1928 †
Fusiconus orbignyi (J.V. Audouin, 1831)
Stephanoconus orcagnae (FOSSIL) Oppenheim, 1901 †
Poremskiconus orion (W.J. Broderip, 1833)
Conus ornatissimus (FOSSIL) Martin, 1883 †
Conus ornatus (FOSSIL) C.J. Maury, 1917 †
Conus ornatus (FOSSIL) Michelotti, 1847 †
Conus ornatus (FOSSIL) Hutton, 1873 †
Purpuriconus ortneri E.J. Petuch, 1998
Gradiconus ostrinus J.K. Tucker & M.J. Tenorio,2011
Conasprella otohimeae (J.T. Kuroda & K. Itô,1961)
Chelyconus ottiliae (FOSSIL) Hoernes & Auinger, 1879 †
Conus oweniana (FOSSIL) Anderson, 1905 †
Conus oyamai (FOSSIL) Tomida, 1989 †
Conasprella pacei (E.J. Petuch, 1987)
Profundiconus pacificus (R.G. Moolenbeek& D. Röckel, 1996)
Conasprella pagoda L.C. Kiener, 1929
Conus palabuanensis (FOSSIL) Martin, 1895 †
Conus palmbeachensis (FOSSIL) E.J. Petuch, 1994 †
Conus palmerae (FOSSIL) J.R. Hendricks& R. Portell, 2008 †
Conus pamotanensis (FOSSIL) Martin, 1906 †
Pygmaeconus papalis (H.C. Weinkauff, 1875)
Conus papillifer (FOSSIL) Mayer-Eymar, 1903 †
Floraconus papilliferus (G.B. I Sowerby, 1834)
Kioconus papuensis (H.E. Coomans& R.G. Moolenbeek, 1982)
Conus paradoxus (FOSSIL) Locard, 1877 †
Conus paraguana E.J. Petuch, 1987
Conus paranobilis (FOSSIL) E.J. Petuch, 1991 †
Gradiconus parascalaris (E.J. Petuch, 1987)
Conus pardalinus J.H.F. Link, 1807