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Biodiesel is produced commonly by alcoholysis of lipid feedstock using homogeneous catalysts (e.g. KOH) soluble in an alcohol phase. Unfortunately, this process involves multiple purification steps of biodiesel and glycerol due to catalyst existence in both phases that hinder process viability. Besides, contents of free fatty acids FFAs > 2 wt%, and the presence of moisture limit the application of homogeneously catalyzed transesterification. Accordingly, heterogeneous catalysis is preferred owing to the ease of catalyst separation as well as its reusability. Within the field of heterogeneous catalysis, there is an ongoing trend to produce highly active solid catalysts based on chicken, animal and fish wastes as a way of waste management. This chapter introduces a review on the use of different fish and animal wastes, including their bones and fish scales, to produce active catalysts for biodiesel synthesis from various …