The chapter critically reviews the potentials of various natural fibers on the fire-resistance behavior of biocomposites and bionanocomposites. It evaluates the potential of fibers like cotton, hemp, and bamboo for flame retardation in combination with the different matrix materials and is assessed for its interaction. Material combinations and hybridization strategies of the examples given in this chapter are synergistically influential in enhancing the fire performance. It also deals with developments in natural fiber technologies with its persistent challenges on sustainability and environment-oriented issues. Future research recommendations are concerned with technological advances in composites reinforced using natural fibers. The highlighted main development covers much safer materials which are environmentally more sustainable with better flame resistance.