Glass fiber reinforced composite has gained attention from various engineering fields because of its enhanced properties. This paper reviewed the mechanical characteristics, such as tensile strength, flexural strength, hardness number, impact strength, wear percentage, etc., of the composites from different experimental studies performed by various researchers over time; by varying with the weight percentage of different metal and non-metal nanoparticles. The main observation was that the mechanical properties remained optimal at a certain quantity of nanoparticles was added beyond which these characteristics began to decrease. When more than one type of nanoparticle is dispersed, or micro rubber particles are added with a specific type of nanoparticle, the properties are more pronounced than when only a single type of particle is used.