Phasmoconus jickelii (H.C. Weinkauff, 1873)
Conus joelshugari (FOSSIL) E.J. Petuch, 1994 †
Chelyconus johannae (FOSSIL) Hoernes & Auinger, 1879 †
Gradiconus johntuckeri (FOSSIL) B.M. Landau, F. Da Silva& S.M. Heitz, 2016 †
Fusiconus joliveti (R.G. Moolenbeek, D. Röckel& P. Bouchet, 2008)
Dauciconus jorioi E.J. Petuch, 2013
Conasprella josei (E.J. Petuch& D.P. Berschauer, 2016)
Africonus josephinae (E. Rolán, 1980)
Africonus joserochoi T. Cossignani, 2014
Varioconus jourdani (A.J. Da Motta, 1984)
Purpuriconus jucundus (G.B. III Sowerby, 1887)
Tenorioconus julieandreae (W.P. Cargile, 1995)
Textilia julii E. Liénard, 1870
Conus junghuhni (FOSSIL) K. Martin, 1879 †
Conasprella juttingae (FOSSIL) Pannekoek, 1936 †
Lindaconus kaesleri (FOSSIL) J.R. Hendricks, 2015 †
Dauciconus kaiserae M.J. Tenorio, J.K. Tucker& A. Chaney, 2012
Purpuriconus kalafuti (A.J. Da Motta, 1987)
Profundiconus kanakinus (G. Richard, 1983)
Conolithes kanayai (FOSSIL) T. Shuto, 1969 †
Leptoconus karikalensis (FOSSIL) Cossmann, 1900 †
Conus karlschmidti (FOSSIL) C.J. Maury, 1917 †
Lithoconus karreri (FOSSIL) Hoernes & Auinger, 1879 †
Leptoconus kawamurai T. Habe, 1962
Conasprella kellyae (E.J. Petuch, D.P. Berschauer& Poremski, 2017)
Asprella kendrewi (FOSSIL) E.J. Petuch, 1997 †
Calamiconus kermadecensis (T. Iredale, 1913)
Africonus kersteni (M.J. Tenorio, C.M.L. Afonso& E. Rolán, 2008)
Conus kersteni Thach, 2017
Conus kerstitchi J.G. Walls, 1978
Conasprelloides kevani (E.J. Petuch, 1987)
Conus kieneri L.A. Reeve, 1849
Graphiconus kiicumulus (M. Azuma, 1982)
Conus kikaiensis (FOSSIL) Pilsbry, 1904 †
Conasprella kimioi (T. Habe, 1965)