This study aimed to develop and characterize galactomannan-based films reinforced with cellulose fibers derived from acerola (Malpighia emarginata DC) residues. Galactomannan, a polysaccharide abundant in seeds from Fabaceae family plants, was extracted from Adenanthera pavonina L. seeds. Films were prepared using a 2% galactomannan solution with cellulose fibers incorporated at concentrations of 0.25%, 0.5%, and 0.75%. The electrical properties of these films were evaluated via impedance spectroscopy. Results indicate that the addition of cellulose fibers improves the electrical stability of the films, supporting their potential use in energy storage applications, such as biocompatible capacitors. These findings demonstrate that reinforcing galactomannan with cellulose fibers effectively enhances dielectric properties, underscoring its promise for sustainable organic device development in the electronics industry.