The global food industry is continually challenged by the prevalence of food fraud and contamination, which undermine consumer trust and safety. Driven by economic pressures, lack of regulatory oversight, and complexities within the global supply chain, instances of mislabeling, adulteration, and contamination are frequent and widespread, exemplified by notable scandals such as the Horse Meat Scandal and adulterated olive oil in Europe. These practices not only pose serious health risks but also result in significant economic losses and environmental damage. Blockchain technology offers a promising solution to these pervasive issues by enhancing the traceability and transparency of food supply chains. This chapter examines the role of blockchain in mitigating food fraud and contamination through its decentralized ledger system, which ensures immutable record-keeping and tamper-proof data. By integrating blockchain with IoT devices and employing smart contracts, stakeholders in the food supply chain can maintain real-time monitoring and seamless verification of all transactions. These features facilitate the immediate detection and rectification of any discrepancies in the food supply chain from the point of origin to the consumer. Practical applications of blockchain, such as the TE-FOOD platform and Open SC, demonstrate its effectiveness in providing transparent and traceable food supply chains. These platforms help trace the journey of food products, enhancing consumer trust and compliance with safety standards. The integration of blockchain technology thus not only addresses the direct issues of food fraud and contamination but also contributes to a more sustainable and ethical global food economy. Through detailed case studies and analysis, this chapter highlights how blockchain technology is transforming the food industry by fostering a secure, transparent, and reliable supply chain environment.