Active food packaging has emerged as a potential technology in recent years, intending to increase the shelf life of food goods while maintaining quality and safety. Polymer nanocomposites have garnered significant attention among the many materials being researched for active packaging due to their versatile and adjustable properties. This book chapter thoroughly overviews the latest developments in polymer nanocomposites for active food packaging applications. It goes into the principles of active packaging, clarifies the function of polymer nanocomposites, and investigates how they might be used to solve problems with food safety and preservation. This chapter looks at the different kinds of nanoparticles mixed into polymer matrices, how they work, and how they affect the characteristics of food packaging. The chapter also covers new sensor developments that use nanocomposite technology and antimicrobial packaging options. Future perspectives and issues in the field are highlighted, and the debate offers insights into possible research routes and chances for innovation in active food packaging technology.