The crystal structure of Bithionol, $C_{12}H_6Cl_4O_2S$, has been determined from X-ray intensity data measured by Enraf-Nonius CAD-4 diffractometer using graphite-monochromatized $Mo-Kalpha$ radiation. The crystal data as follows; triclinic space group P{ar{1}}$, a = 8.879(2), b = 10.782(1), c = 8.511(1)${AA}$, ${alpha}$ = 115.43(1), ${eta}$ = 115.22(1), ${gamma};=;74.44^{circ}(1)$. ${mu};=;9.51;cm^{-1}$, F(000) = 356, Z = 2. Final R value is 0.036 for independent 2669 observed reflections. Each six-membered benzene rings are coplanar within experimesntal errors and the dihedral angle between these planes is $81.28^{circ}$ (1). The S-(1) and S-C(7) distances are 1.787(2) and 1.791(3)${AA}$, respectively.