In Northern Europe, this species is found in Denmark,[REF] in Sweden as far north as 58° N [REF].
Shells of Theodoxus fluviatilis have been found in an Upper Paleolithic archaeological site in the cave Caldeirão, Pedreira (Tomar), Tomar Municipality, Portugal,[REF] and also in a site from about 6000 years B.P. of Litorina age on the Åland Islands [REF].