Mapping and understanding what shapes public attitudes are particularly critical at a time when immigration is often perceived as one of the most important political issues facing countries around the world, with significant implications for election outcomes and migration policies. This Data Bulletin explores data on public opinion on migration. Such data can serve as a useful indicator of how open receiving societies are towards immigration and ethnic diversity. Meanwhile, the availability and accuracy of data related to migration, and how migration data are presented in the media can affect public opinion.