The crystal structure of [Sn(pydc)(OH)(H₂O)(μ-OH)]₂·4H₂O, (pydc = 2,6-pyridinedicarboxylate), has been determined by the X-ray diffraction method. This compound crystallizes in the triclinic system, space group P₁, with two molecules per unit cell. The unit cell dimensions are a = 6.5534(13)Å, b = 7.4907(15)Å, c = 12.030(2)Å, with α = 85.42(3)°, β = 82.92(3)° and γ = 74.83(3)°. The final R value is 0.0528 for 3258 reflections measured. The complex is binuclear with two bridging OH groups. Each of the two Sn atoms is also coordinated by the chelate [pydc]^2- ligand and one terminal OH group as well as by one terminal water molecule.