The asymmetric unit of the title complex, [Co(C5H5N3O)2(H2O)2](NO3)2, contains one half of a CoII cationic unit and a nitrate anion. The entire [Co(C5H5N3O)2(H2O)2]2+ cationic unit is completed by the application of inversion symmetry at the CoII site, generating a six-coordinate distorted octa­hedral environment for the metal ion. The chelating pyrazine-2-carboxamide mol­ecules are bound to cobalt via N and O atoms, forming a square plane, while the remaining two trans positions in the octa­hedron are occupied by two coordinated water mol­ecules.