In the title compound, C(12)H(7)Cl(4)NO(2)S, the N-H bond in the C-SO(2)-NH-C segment is syn with respect to the ortho-Cl atom of the sulfonyl-benzene ring and one of the meta-Cl atoms of the aniline ring. The C-SO(2)-NH-C torsion angle is -93.9 (2)°. The benzene rings are tilted relative to each other by 61.9 (1)°. The crystal structure features inversion-related dimers linked by pairs of N-H⋯O hydrogen bonds.