In the title compound, C(16)H(12)N(2)OS(2), the dihedral angles between the mean planes of the central thio-urea core and the thio-phene ring and the naphthalene ring system are 1.8 (2) and 6.45 (18)°, respectively. The mol-ecule adopts a trans-cis conformation with respect to the position of thio-phenoyl and naphthyl groups relative to the S atom across the thiourea C-N bonds. Both the thio-phene ring and the sulfanyl-idene S atom are disordered over two sets of sites with occupancies of 0.862 (3):0.138 (3) and 0.977 (3):0.023 (3), respectively. An intra-molecular N-H⋯O hydrogen bond is observed. The crystal packing features two N-H⋯S hydrogen bonds.