Orthoceras etheridgei (FOSSIL) Blake † UK, Scotland
Orthoceras eutrichum (FOSSIL) Whidborne † UK, Devon
Orthoceras evanescens (FOSSIL) Barrande, 1866 † Czech Republic, Bohemia
Orthoceras exoticum (FOSSIL) Barrande, 1866 †
Orthoceras expansum (FOSSIL) C.H. Blake, 1882 † Northern Ireland
Orthoceras fluctuatum (FOSSIL) Salter † UK, Wales
Orthoceras fluminense (FOSSIL) (Meneghini, 1857 †) Morocco, Tafilalet
Orthoceras ganimedes (FOSSIL) Barrande, 1866 † Czech Republic, Bohemia
Orthoceras geinitzi (FOSSIL) d'Orbigny, 1850 †
Orthoceras gradatum (FOSSIL) C. Gemmellaro, 1889 † Italy, Sicily, Palermo
Orthoceras grindrodi (FOSSIL) Blake, 1882 † UK, England, Herefordshire
Orthoceras hulli (FOSSIL) C. Gemmellaro, 1889 † Italy, Sicily, Palermo
Orthoceras hungaricum (FOSSIL) Blake † UK, Wales
Orthoceras kawasakii (FOSSIL) T. Kobayashi, 1928 † South Korea
Orthoceras lambi (FOSSIL) J.J.F. Whiteaves † Minnesota
Orthoceras latissimum (FOSSIL) Portlock † Ireland
Orthoceras lentum (FOSSIL) Ruedemann, 1906 † USA, New York, Clinton
Orthoceras lepton (FOSSIL) C. Gemmellaro, 1889 † Italy, Sicily, Palermo
Orthoceras lesueuri (FOSSIL) A.H. Clarke, 1897 † Minnesota
Orthoceras luhai (FOSSIL) Stumbur, 1956 †
Orthoceras modestum (FOSSIL) Ruedemann, 1906 † USA, New York, Clinton
Orthoceras nakamurai (FOSSIL) T. Kobayashi, 1927 † South Korea
Orthoceras nicolleti (FOSSIL) A.H. Clarke † Minnesota
Orthoceras niissoni (FOSSIL) Boll, 1857 †
Orthoceras novator (FOSSIL) Barrande, 1868 † Czech Republic, Bohemia
Orthoceras oehlerti (FOSSIL) C. Gemmellaro, 1889 † Italy, Sicily, Palermo
Orthoceras orientale (FOSSIL) Fliegel, 1901 † Indonesia, Padang Highlands
Orthoceras oryx (FOSSIL) Whidborne † UK, Devon
Orthoceras oweni (FOSSIL) Ulrich, 1894 † Minnesota
Orthoceras pendens (FOSSIL) Blake † UK, Scotland
Orthoceras perroti (FOSSIL) A.H. Clarke † Minnesota
Orthoceras pertinens (FOSSIL) Blake † UK, Scotland
Orthoceras planoconvexum (FOSSIL) J.W. Hall † Minnesota
Orthoceras planodorsatum (FOSSIL) R.P. Whitfield † Minnesota
Orthoceras primaevum (FOSSIL) (Forbes) † UK, Wales