Poly[[diaquabis(2,2′-bipyridine-κ(2) N,N′)(μ(3)-5-hydroxyisophthalato-κ(5) O (1),O (1′):O (3),O (3′):O (3′))(μ(3)-5-hydroxy­isophthalato-κ(4) O (1),O (1′):O (3):O (3′))(μ(2)-5-hydroxyisophthalato-κ(3) O (1),O (1′):O (3))didysprosium(III)] dihydrate]

The polymeric title compound, {[Dy(2)(C(8)H(4)O(5))(3)(C(10)H(8)N(2))(2)(H(2)O)(2)]·2H(2)O}(n), contains two independent Dy(III) ions, both of which are nine-coordinated in a distorted tricapped trigonal–prismatic geometry. One Dy(III) ion is coordinated by five 5-hy­droxy­isophthalate (hip) ligands and one 2,2′-bipyridine (bpy) ligand and the other by three hip ligands, one bpy ligand and two water mol­ecules. The Dy(III) ions are bridged by the carboxyl­ate groups of the hip ligands, forming a three-dimensional framework. O—H⋯O hydrogen bonds are present in the crystal structure.