Electrolytic codeposition was employed as a low-cost alternative process to fabricate composite coatings containing Mn₃O₄ particles in a Co matrix for potential applications in solid oxide fuel cells. The effects of codeposition parameters on the Mn₃O₄ particle incorporation, cathode current efficiency, and coating uniformity were investigated using a Design of Experiments (DoE) approach. Concentration of Mn₃O₄ particles in the plating solution, agitation rate, current density, and solution pH were the four factors considered in the fractional factorial 2^(4-1) design. With different combinations of the deposition parameters, the amount of Mn₃O₄ particles incorporated in the composite coatings ranged from 0 to 12vol.%. The DoE results indicate that the pH of the plating solution exhibited the greatest importance on both particle incorporation and current efficiency, which were decreased significantly below pH2. The Mn₃O₄ concentration in the plating bath showed the second strongest effect on particle incorporation, followed by the agitation rate. While the applied current density did not appear to affect the Mn₃O₄ particle incorporation, it had a strong influence on coating thickness uniformity.