This work intended to study the effect of the surface scratch depths with scratch depths of 272, 416 and 573 μm on the drop weight (impulse) impact energy of glass fiber mats reinforced unsaturated polyester composites with 25 Vol.% fiber volume content. Moreover, the fracture behavior of the abovementioned composites was also investigated for each case. The results showed that the impact energy of scratched composites was enhanced by adding the scratch on the compression side for different scratch depths compared to that of the virgin specimen. Moreover, effect of increasing scratch depth has slightly effect on the total impact energy and time duration contact of the composites. The fracture behavior showed that by adding the scratch to the compression side of the composites for different scratch depths, the crack deflection and delamination propagate along the weak preferable path (scratch path) and so the area of the crack increases and this dissipates most of the impact energy and so the impact energy is improved. Moreover, on the back face matrix cracks and fiber splitting are the main failure mode and the perforation is accompanied by a pyramid-shaped back face failure.