The presence of toxic metals in industrial wastewater has resulted in serious health problems. However, removing these metals using natural biopolymers has proven to be a challenge because of their poor recovery, low surface area, and water solubility. To address this, bionanohybrids with other metals like silver, zinc, and copper have been developed as they exhibits large surface area, structural porosity, and maximum reactivity. These composites, known as bionanohybrids, have shown maximum adsorption potential for heavy metals. Gelatin-based bionanohybrids are ample, cheap, decomposable, and contain active functional parts such as amine, carboxyl, hydroxyl, and carbonyl that plays an active role in adsorbing metal ions by using numerous weak forces such as hydrogen bonding, electrostatic forces, ion exchange interaction, and chelation. In this chapter, synthesis, characterization, morphology, size, structure modification, adsorption capacity, mechanism, as well as the most-fitted thermodynamics and kinetic models for suitability of gelatin-based bionanohybrids as an adsorbent, are discussed. It is concluded that functionalized, gelatin-based bionanohybrids have significant potential for adsorption of heavy metal ions and may be considered as the impending materials for environmental restoration.