Theodoxus rugosus (FOSSIL) (P.S. Pavlovic, 1931 †)
Theodoxus saincenyensis (FOSSIL) G.P. Deshayes, 1864 †
Theodoxus sandalina C.A. Récluz, 1842
Theodoxus sarmaticus (W.A. Lindholm, 1901)
Theodoxus saulcyi (J.R. Bourguignat, 1852)
Theodoxus scamandrius (FOSSIL) (Calvert& M. von Neumayr, 1880 †)
Theodoxus schachmaticus (FOSSIL) (N.I. Andrusov, 1909 †)
Theodoxus schultzi (O.A. Grimm, 1877)
Theodoxus scoliogramma (FOSSIL) (Š. Brusina, 1884 †)
Theodoxus scriptus (FOSSIL) (Stefanescu, 1896 †)
Theodoxus semidentatus (FOSSIL) (C.L.F. von Sandberger,1875 †)
Theodoxus semiplicatus (FOSSIL) (M. von Neumayr, 1875 †)
Theodoxus serratiliniformis (FOSSIL) D. Geyer, 1914 †
Theodoxus serrulatus (FOSSIL) (Š. Brusina, 1892 †)
Theodoxus simplex (FOSSIL) (A. Fuchs, 1877 †)
Theodoxus sinjanus (FOSSIL) (Š. Brusina, 1876 †)
Theodoxus slavonicus (FOSSIL) (Š. Brusina, 1878 †)
Theodoxus sobrinus (FOSSIL) A.E.J. Férussac, 1823 †
Theodoxus soceni (FOSSIL) E. Jekelius, 1944 †
Theodoxus sophievkaensis (FOSSIL) Gozhik in Gozhik& Datsenko, 2007 †
Theodoxus sphaeroidalis (FOSSIL) (Revilla, 1958 †)
Theodoxus spratti (FOSSIL) (B.W. Jenkins, 1864 †)
Theodoxus stanae (FOSSIL) (Š. Brusina, 1893 †)
Theodoxus stefanescui (FOSSIL) (C.F. Fontannes, 1887 †)
Theodoxus stefanescuiformis (FOSSIL) Gozhik in Gozhik& Datsenko, 2007 †
Theodoxus stoicai (FOSSIL) T.A. Neubauer, M. Harzhauser, E. Georgopoulou, O. Mandic& A. Kroh, †
Theodoxus subdoricus (FOSSIL) H. Schütt, 1976 †
Theodoxus subglobosus (FOSSIL) (K.E.I. von Eichwald,1853 †)
Theodoxus subquadrofasciatus (FOSSIL) Gozhik, 2002 †
Theodoxus subslavonicus (FOSSIL) Gozhik, 2002 †
Theodoxus subterrelictus H. Schütt, 1963
Theodoxus subthermalis J.R. Bourguignatin A. Issel, 1865
Theodoxus sundicus (FOSSIL) (N.I. Andrusov, 1909 †)
Theodoxus suskalovici (FOSSIL) (P.S. Pavlovic, 1903 †)
Theodoxus sycophantus (FOSSIL) (Š. Brusina, 1878 †)