T This research was carried out to optimize the electrodeposition process of nickel (ni) and cobalt (co) from nickel sulfate (niso₄) solution using the electrowinning method, which is known as an efficient and environmentally friendly electrochemical refining technique. the main focus of this study is to improve the deposition efficiency of nickel by examining the influence of variations in current density (200, 250, 300, and 350 a/m²) and electrode spacing (3, 5, 7, and 9 cm) on the process results and to determine the combination of parameters that delivers the best performance. laboratory experiments were conducted using an electrolyte solution consisting of 75 grams of niso₄ and 7.5 grams of coso₄ in 750 ml of water, carried out at room temperature with identical electrolysis times for all experiments. the deposited metals collected on the cathode were dried, weighed, and compared with the theoretical mass calculated using faraday’s law to determine the actual efficiency of the process. data analysis was conducted using the taguchi method with an orthogonal array design and the signal to noise ratio (s/n ratio) approach, applying the “larger is better” criterion to identify the most stable parameter combination. the results show that the highest deposition efficiency, reaching 47.98%, was achieved at a current density of 200 a/m² with an electrode spacing of 7 cm, while the s/n ratio analysis indicates that the most stable condition was obtained at 350 a/m² and 7 cm electrode spacing. these findings demonstrate that the numerically highest efficiency does not always correspond to the most stable process, and the taguchi method has proven effective in identifying operational conditions with consistent results, making it relevant for application in industrial-scale electrowinning.