In the title compound, C26H18Cl2N2O5S, the carbazole ring system is essentially planar with a maximum deviation of 0.0498 (16) Å for the N atom. The carbazole ring system is almost orthogonal to the phenyl-sulfonyl and di-chloro-substituted nitro-phenyl rings, making dihedral angles of 84.23 (7) and 85.46 (12)°, respectively. The mol-ecular structure features intra-molecular C-H⋯O inter-actions, which generate two S(6) ring motifs. In the crystal, mol-ecules are linked by C-Cl⋯O halogen bonds [3.016 (3) Å, 166.63 (5)°], which generate infinite C(8) chains running parallel to [010].