In the polymeric title complex, {[Mn(C(8)H(4)O(4))(C(7)H(6)N(2))(H(2)O)(2)]·2H(2)O}(n), the Mn(II) cation is coordinated by two benzene-dicarboxyl-ate anions, one benzimidazole ligand and two water mol-ecules in a distorted MnNO(5) octa-hedral geometry. In the crystal, each benzene-dicarboxyl-ate anion bridges adjacent Mn(II) cations through the terminal carboxyl-ate groups, forming a polymeric complex chain along the a axis. One Mn-O(carboxyl-ate) bond is much longer than the others. In the crystal, π-π stacking is observed between nearly parallel [dihedral angle = 4.32 (6)°] benzimidazole aromatic ring systems of adjacent mol-ecules, the centroid-centroid distance between the imidazole and benzene rings being 3.5421 (11) Å. Extensive inter-molecular O-H⋯O and N-H⋯O hydrogen bonding is present in the crystal structure. The two lattice water mol-ecules are located on twofold rotation axes.