Mol-ecules of the title compound, C(28)H(22)S(2), are located on a crystallographic mirror plane with one half-mol-ecule in the asymmetric unit. The dihedral angle between the phenyl ring and the naphthyl unit is 83.14 (7)°. In the crystal, mol-ecules are inter-connected by C-H⋯S and C-H⋯π inter-actions.