The captivating world of biotoxins, often perceived as nature’s formidable weapons, presents an intricate and promising landscape for scientific exploration and innovation. Biotoxins, originating from a vast spectrum of life forms such as bacteria, fungi, plants, and animals, exhibit a remarkable diversity of bioactive compounds. Their structural diversity, coupled with potent biological activities, positions them as valuable resources for drug discovery, agricultural and environmental management. This chapter highlights into specific case studies where biotoxins have been harnessed to develop antivenom, anti-cancer agents, analgesics, other therapeutic marvels, etc. The comprehensive understanding of biotoxin mechanisms, bioprospecting, and biotechnological tools, including genetic engineering and synthetic biology, offers exciting avenues for the sustainable extraction, production, and modification of biotoxins. The biotechnological harnessing of biotoxins emphasizes the significant progress and potential future applications of biotoxins reliant on collaboration among researchers, clinicians, and regulators to unlock their full capacity.