In the centrosymmetric title compound, [Co(C(7)H(4)NO(4))(2)(C(12)H(9)N(5))(2)(H(2)O)(2)]·2H(2)O, the Co(II) atom, located on an inversion center, is coordinated by two N atoms [Co-N = 2.155 (3) Å] and four O atoms [Co-O = 2.099 (2)-2.117 (3) Å] in a distorted octa-hedral geometry. Inter-molecular N-H⋯O, O-H⋯N and O-H⋯O hydrogen bonds link the components into a three-dimensional supramolecular framework.