In the title compound, C13H10ClNOS2, the dihedral angle between the rhodanine (r.m.s. deviation = 0.008 Å) and 4-chlorobenzylidene rings is 1.79 (11)°. The allyl group attached to the N atom, which lies almost perpendicular to the rhodanine ring, is disordered over two orientations in a 0.519 (13):0.481 (13) ratio. A short intramolecular C—H⋯S interaction closes an S(6) ring. In the crystal, molecules are linked by π–π stacking interactions [centroid–centroid separation = 3.600 (15) Å], generating inversion dimers.