In the crystal structure of the title compound, C(16)H(11)NO(5)S, the plane of the naphthalene ring system forms a dihedral angle of 63.39 (8)° with the benzene ring. The nitro group makes a dihedral angle of 10.73 (16)° with the benzene ring. Weak intra- and inter-molecular C-H⋯O inter-actions are observed.