In the title compound, [Co(C(5)H(4)NO(3))(2)(H(2)O)(2)]·2H(2)O, the coordination polyhedron around the six-coordinate Co(II) ion is formed by two equatorial 5-methyl-isoxazole-3-carboxyl-ate ligands in an N,O(3)-bidentate fashion through the isoxazole N atom and a carboxyl-ate O atom, and by two axial water ligands. The asymmetric unit consists of half of the complex and one water mol-ecule (the full comlex being completed by application of inversion). In the crystal, the water mol-ecules participate in the formation of an intricate three-dimensional network of hydrogen bonds involving the coordinated water mol-ecule and the carboxyl-ate groups.