In the title compound, C(15)H(10)ClNO(4)S, the benzothia-zole ring system is essentially planar [maximum deviation = 0.0382 (13) Å for the N atom] and forms a dihedral angle of 74.43 (6)° with the chloro-substituted benzene ring. In the crystal structure, weak inter-molecular C-H⋯O hydrogen bonds form R(2) (2)(10) and R(2) (2)(16) ring motifs.