Synthetic plastic-based products are very dangerous for human beings and the environment due to their toxicity during their whole life. Bio resources are the strong alternatives and cultivating more to form the composite materials due to their biodegradable and non-toxic nature. Humans are shifting from toxic plastic-based composites to natural bio fibers composites due to their main advantages of being biodegradable and having hydrophilic properties. Bio fibers are the material which can be attained by plants, crops, agricultural, or forestry wastages. The present study demonstrates the impact of flax fiber reinforcement on mechanical performance of developed flax/epoxy composites. Flax reinforcement was taken on 20, 30, and 40 by weight percentage with epoxy polymer matrix to develop the composite materials. Experimental testing of hardness, tensile, flexural, and Charpy Impact test methods were executed to analyze mechanical behavior of prepared composite specimens. Among all the developed composite specimens, 30wt.% of flax reinforced epoxy composite achieved maximum mechanical (tensile, flexural, and impact) strength. Above 30 wt.% of flax, mechanical properties of prepared specimen show the decrement.