Abstract
As citizen science projects increase in number, scope and relevance to policy, the conduct of the underlying research is likely to come under greater scrutiny, particularly if any resulting research findings are to be regarded as legitimate. Among the most important aspects of research ethics scrutiny is the handling of data. The ever-increasing attention to the data protection rights of citizens can be seen across research domains, from health to environmental impacts. Careful attention to data protection is essential to the sustainability of citizen science for practical reasons as well. Complying with data protection laws is not optional. It is a legal requirement. Failure to meet the requirements can result in substantial fines, which most citizen science projects can ill afford. Moreover, the scientific, political and legal viability of citizen science hinges on getting data protection right. This article sets out some of the key data protection considerations that commonly arise in conducting a citizen science project.