The title compounds (C₁₄H₁₁O₂SBr) are cis and trans-isomers of 4-bromophenylstyrylsulfone. These compounds crystallize in monoclinic space groups C2/c and P2₁/c, respectively. The cell parameters for cis are: a = 14.866(2)Å, b = 14.133(3)Å, c = 12.830(2)Å, β = 90.58(1)°, Z = 8, V = 2657.88(4)ų and D_calc = 1.615 Mg m^-3; trans are: a = 6.964(1)Å, b = 10.840(1)Å, c = 17.583(10)Å, β = 94.09(2)°, Z = 4, V = 1324.1(10)ų and D_calc = 1.621 Mg m^-3. The geometries of both molecules were compared. In the cis-isomer, the groups at C(7) and C(8) are cis oriented, as the torsion angle is 3.9(1)°, whereas in the trans-isomer the angle is 175.2(3)°, indicating that, the orientation is trans. The cis-isomer molecule exhibits a folded structure compared to the trans-isomer. In the molecular packing, two adjacent molecules form square-shaped structures in the crystal. This is one of the important facets of the molecular packing.