In the mol-ecule of the title compound, C(14)H(10)ClNO(2)S, the dihedral angle between the almost planar benzothia-zole ring system [maximum deviation = 0.005 (2) Å] and the benzene ring is 1.23 (9)°. The conformation of the mol-ecule is stabilized by an intra-molecular O-H⋯N hydrogen bond, forming an S(6) ring motif. In the crystal, mol-ecules are linked into layers parallel to the ac plane by C-H⋯O hydrogen bonds and π-π stacking inter-actions [centroid-centroid distance = 3.7365 (12) Å].