In the title compound, C(20)H(17)BrClNO(2)S, the dihedral angle between the benzene ring and the naphthalene plane is 8.95 (8)°. The crystal packing is stabilized by weak inter-molecular C-H⋯O, C-H⋯Cl and π-π [centroid-centroid distance = 3.8782 (16) Å] inter-actions.