In this study, the effect of acorn powder reinforcement at different percentages on the mechanical and quasi-static penetration behavior of glass fiber reinforced composites was investigated. Reinforcement materials used are woven E-glass fiber and cleaned acorn micro powders. Powders were cleansed from impurities with a sodium hydroxide solution. Cleaned powders were mixed with resin by using a mechanical mixing method. Thereafter, resin mixture was applied to glass fibers with hand lay-up method and composite plate was produced by vacuum bag method. Quasi-static penetration tests were performed at room temperature as well as mechanical tests. While 1, 10 and 20 mm/min were selected as quasi-static penetration test speed, tension, compression and three point bending tests were selected as mechanical tests. Force and energy test results of quasi-static penetration tests of composites were compared with each other. Additionally, tensile, compressive and flexural strengths of the composites were investigated.