In the title compound, C(17)H(14)ClN(5)OS, the dihedral angles formed by the two benzene rings with the triazole ring are 66.88 (3) and 19.16 (3)°, and the benzene rings are inclined to each other with a dihedral angle of 78.40 (3)°. Inter-molecular N-H⋯O hydrogen bonds link the mol-ecules into layers parallel to the (100) planes, and centrosymmetric π-π stacking inter-actions [centroid-centroid distance = 3.7717 (5) Å] are formed between benzene rings in neighbouring layers.