This article provides a critical and global overview of current research into public opinion about science and technology (S&T). Although several sets of high-quality data exist, there remains a lack of international coordination and irregular release of new data in forms that can be widely used. The article highlights a range of key challenges that those involved in collecting and reporting public opinion data about S&T can address to provide society with a more comprehensive and more integrated picture of attitudes and understanding about S&T around the world.