The molecules of the title compound, C(17)H(21)N(3)OS, are characterized by a wide C-C-C angle at the methine C atom linking the aryl and thiazolidine rings, associated with a short repulsive intramolecular S...H contact between atoms in these two rings. A single piperidine-arene C-H...π hydrogen bond links pairs of molecules into centrosymmetric dimers.