Theodoxus maresi is a species of small freshwater snail with an operculum, an aquatic gastropod mollusk in the family Neritidae the nerites.

This species is found in Algeria and Morocco.

[1][2] The type locality is Aïn Khadra, near Zerguin, in north-eastern Algeria.

[2] The length of the shell is 8 mm.

This Neritidae-related article is a stub.