Food industry and researchers tend to new trends due to increasing conscious and demands of consumers for food safety and quality. The functions of food packaging materials could be modified / increased by the applications of new technologies and/or the additions of new materials. Nanotechnological applications in different fields have produced successful results for obtaining composite materials with unusual properties for different purposes. Food packaging is one of these fields. The nano-sized materials or nanocomposites are used in active or smart packaging which communicates with consumers. In this review, nanotechnology applications in food packaging are summarized along with the possible utilization of phase changing materials (PCM) in food packaging. PCMs are already used for maintaining of foods during transportation. It seems that PCM in food packaging is very promising. In addition, manipulation of PCM by nanotechnology appears to have a great potential in food packaging.