Failure control of pipelines due to internal corrosion can be realized by the addition of chemical inhibitors. The environtmentally benign nature of organic-based inhibitors, known as “green inhibitor” or “bioinhibitor,” makes them promising for more development. By producing a barrier that prevents metal from contact with the environment, organic molecules adsorbed on metal surfaces can reduce the corrosion rate. This study aimed at analyzing the effect of Bajakah Tampala (Spatholobus littoralis Hassk) extract added in a corrosive media of 3.5% NaCl solution. In this work, the test material used was carbon steel API 5L Grade B in 3.5% NaCl solution media with concentration variations of inhibitor of 0, 250, 500, and 750 ppm Bajakah Tampala extract. The extraction process involved maceration in a 96% alcohol solvent, followed by concentrating in a rotary evaporator. Potentiodynamic polarization and immersion tests were used to measuring the corrosion rate. The phase of rust was determined by XRD analysis. The findings of this study pointed out that the efficiency of Bajakah Tampala extract that can be obtained was 68% at a concentration of 750 ppm.