Corrosion is a essential process that has a significant economic and safety impact. Corrosion cannot be avoided, but its severity can be prevented. Inhibitors have always been considered to be the first line of defense against corrosion. This research focuses into the usage of maize starch tapioca to improve mild steel corrosion inhibitors in seawater. The corrosion behaviour of mild steel in saltwater was investigated using gravimetric, potentiodynamic polarisation, and linear polarisation resistance measurements. The addition of maize starch greatly reduces the corrosion rates, corrosion current densities (icorr), and corrosion rates twofold (CR) in mild steel in seawater, while concurrently boosting the values of polarisation resistance (Rp). As the concentration of maize starch rises, so does the efficiency of inhibition. The prospective application of maize starch addressed in this study is in keeping with the current trend of environmentally responsible thinking.