Adopting the model of a Circular Economy (CE) has proved to be an effective way of combatting the pollution of our environment and saving resources, while at the same time promoting socially just growth. Thailand has felt the negative impacts of the current linear economy in many areas, such as plastic packaging and food waste management. This paper examines the opportunities and challenges of the implementation of a CE in the latter areas. It finds that the current policy direction in Thailand facilitates the transformation towards circularity in plastic packaging and food waste management. However, the ecosystem of rules and policies for a CE is still incomplete and circularity has so far mainly been driven by voluntary efforts by the private and public sectors, which is not sufficient. While in the case of plastic packaging an enhanced legal framework is required, enhanced food waste management in the future must rely on clear targets that should be set at the sectoral level.