Bamboo and E-glass fiber-reinforced polypropylene (PP) based composites (50 wt% fiber) were fabricated by compression molding. Tensile strength (TS), bending strength (BS), tensile modulus (TM), bending modulus (BM) and Elongation at break (%) of the bamboo fiber reinforced PP composite was found to be 62 MPa, 78 MPa, 4.96 GPa, 5.76 GPa, and 5.0%, respectively. Then, E-glass fiber-reinforced PP-based composites (50 wt% fiber) were also fabricated using the same methods and after that, the mechanical properties of the composites were evaluated. The TS, BS, TM, BM and Eb% of the Eglass fiber reinforced PP based composites were found to be 86 MPa, 88 MPa, 7.0 GPa, 12 GPa, and 16%, respectively. It was revealed that E-glass fiber reinforced based composites had higher TS, BS, TM, and BM compared to bamboo fiber reinforcedbased composites. At ambient conditions, degradation tests of the bamboo/PP composite were performed in soil and it took 24 weeks which showed that after degradation mechanical properties of the bamboo fiber retained its original mechanical properties. After the flexural test, fracture sides of the E-glass/PP and bamboo/PP composites were investigated using scanning electron microscope (SEM) and the results revealed that bamboo-fiber reinforced based composites matrix adhesion less than the E-glass fiber reinforced based composites.