There is a growing trend in replacing conventional polymer composites by renewable materials for various industrial applications. Polymer composites, in which at least one component is biobased or biodegradable, are called biocomposites. Plant fibers have recently been used in biocomposite products due to their highly unique properties such as electrical, mechanical, thermal and optical properties, as well as biodegradability. Another reason for the emerging interest in these biomaterials is the abundancy and low cost. In addition, the growing awareness of environmental issues around the world has led researchers and manufacturers to make efforts in the field of bio-composite materials. In this context, many studies have been carried out to design and implement engineering and technological applications by utilizing plant fibers together with various polymers. As a result of natural bio-source driven high-performance materials, significant achievements have been reported in material science. In this study, the use of various plant fibers to fabricate biocomposite materials, the effects of the type of fibers on mechanical properties and the structure of biocomposites in the production process have been discussed along with future trends of plant fiber reinforced composites.