The Internet of Things (IoT) links physical objects via sensors and software, allowing data exchange over the internet. Advances in sensor technology and communication protocols boost device connectivity. Key features of IoT include interoperability, edge and cloud computing, real-time operations, remote access, automation, security, and integration with other advanced technologies. IoT faces many challenges such as security risks, privacy concerns, energy consumption, data management issues, and system complexity. These drawbacks significantly impact various sectors such as smart grid, smart cities, healthcare, agriculture, consumer devices, and transportation. Standardization is crucial for ensuring interoperability, security, and scalability, with international and Indian standards driving innovation and adoption. This chapter presents an extensive review of international standards (namely, IEEE, IEC, ANSI, ISO, etc.) and national standards (namely, the Bureau of Indian Standards [BIS], etc.) of IoT applicable to various domains such as healthcare, agriculture, food industry, smart home, industrial automation, disaster management, cybersecurity, and data science. Standards presented in this chapter would be helpful for all the research and development aspirants in this domain from both academic and industrial perspectives.