 The study investigates the flexural properties of biocomposites based on polypropylene kenaf fiber, polypropylene grafted melaic anhydride, PP-kenaf PP-GMA, using response surface methodology, with a three-factor, three-level boxperhenkin design. Optimal compositions for better flexural properties were obtained from contour plots and response surface methodology, resulting in an optimal flexural strength of 53.66 MPa and modulus of 3,442 MPa. The results showed a good agreement between the experimental and predicted values, with a correlation coefficient of 0.998. Morphological and thermal stability evaluations were conducted using scanning electron microscopy and thermogravimetric analysis. This article was authored by Hesse Medinyagoubi and Abdul Hossein Faridoum.