The Internet of Medical Things (IoMT) is revolutionizing healthcare by enabling real-time monitoring, data sharing, and improved patient outcomes through interconnected medical devices. However, IoMT faces significant challenges, including data security, privacy, interoperability, and trust among stakeholders. Blockchain technology, with its decentralized, immutable, and transparent nature, offers promising solutions to address these challenges. This chapter explores the integration of blockchain technology in IoMT, presenting a comprehensive overview of its potential to enhance data security, ensure patient privacy, and streamline operations through smart contracts and decentralized frameworks. Key architectural components, blockchain-enabled frameworks, and consensus mechanisms suitable for IoMT are discussed in detail. Real-world applications, including patient data management, supply chain transparency, and remote patient monitoring, are highlighted alongside case studies demonstrating successful implementations. The chapter also examines the limitations and challenges of adopting blockchain in IoMT, such as scalability, regulatory compliance, and integration complexity. Finally, it identifies future research directions, emphasizing the role of emerging technologies like AI, IoT, and quantum-resistant blockchain in advancing IoMT. By bridging the gap between technology and healthcare, this chapter underscores the transformative potential of blockchain in building a secure, efficient, and trustworthy IoMT ecosystem.