The title compound, [Ni(C(2)O(4))(C(5)H(5)N)(2)](n), was synthesized under hydro-(solvo)thermal conditions. The Ni(II) atom, lying on a twofold rotation axis, has an octa-hedral coordination geometry involving two N atoms from two pyridine ligands and four O atoms from two oxalate ligands. The Ni atoms are connected by the tetra-dentate bridging oxalate ligands into a one-dimensional zigzag chain.