Natural fiber is a resource that is found abundantly and cost effective. It is decomposed easily and biodegradable. Natural fibers have a vital place in the industry and have the capability of replacing carbon fibers and conventional glass because of their biodegradability and eco-friendly characteristics. They have significant chemical, mechanical, and physical properties, which vary according to cellulose content in the fiber. Usually, with the increase in the cellulose content, the tensile strength of the fiber increases and with the increase in the non-cellulose content, the tensile strength of the fiber decreases. However, these chemical constituents are not the only factors that determine the tensile strength of the fiber. Certain other factors such as fiber age, maturity, location, and processing methods along with the source of the fiber also influence the tensile strength of the fiber. These properties of the natural fibers make it a vital component in engineering applications. Natural fibers meet the needs of humans and the manufacturing industry with their positive environmental effect and economic outlook. This review provides basic information and a segregated study on the mechanical properties of natural fibers, thus creating opportunities for future research and studies related to natural fiber-reinforced composites.