In the title compound, C14H12ClN3S, the dihedral angle between the terminal benzene rings is 56.6 (2)°; the benzene rings lie to the same side of the molecule. The major twist in the molecule occurs around the Car—N bond (ar is aromatic) [C—N—C—C = 49.9 (5)°]. The configuration about the N=C bond [1.271 (4) Å] is E. The amine H atoms lie on opposite sides of the molecule with one forming an intramolecular N—H⋯N(imine) hydrogen bond and an S(5) ring. In the crystal, centrosymmetric dimers are formed via {⋯HNC=S}2 synthons