In the title compound, (C(6)H(10)N(2))[Ni(C(7)H(3)NO(4))(2)]·5H(2)O, the Ni(II) ion is six-coordinated by two N and four O atoms from two pyridine-2,6-dicarboxyl-ate ligands in a distorted octa-hedral fashion. The crystal packing is stabilized by inter-molecular O-H⋯O and N-H⋯O and weak C-H⋯O hydrogen bonds and π-π inter-actions [centroid-centroid distances = 3.4669 (19) and 3.764 (2) Å].