Is it possible to apply to multiple public universities across different countries without issues?

Yes, you can apply to multiple public universities across different countries without any general restrictions.

Each country and university will have its own application process, deadlines, and eligibility requirements, so you'll need to manage each application separately. Some countries use centralized platforms for applications, while others require you to apply directly to each university.

Be aware that you can only hold one student visa at a time, so after receiving offers, you'll need to choose one university and proceed with that country's visa process.