This document is an open letter signed by 62 think tanks, advocacy groups, and civil society organizations from around the world opposing plain packaging tobacco laws. It argues that plain packaging has failed to achieve its goal of reducing smoking rates after 5 years of implementation in Australia. It also violates intellectual property rights and fuels growth of the illegal tobacco market, costing governments billions in lost tax revenue. The letter urges the WHO and governments to stop pursuing plain packaging policies that infringe on intellectual property rights.