In the title compound, [Mn(2)(C(8)H(4)O(7)S)(2)(C(10)H(8)N(2))(2)(H(2)O)(2)], pairs of hexacoordinated manganese(II) centres are bridged by 2-sulfonatoterephthalate(2-) anions to form cyclic centrosymmetric dimers, which are linked into sheets by O-H...O hydrogen bonds.