This edited book explores how requests and complaints by prisoners are being dealt with by prison governors/administrations or independent bodies (such as complaint commissions), in different parts of Europe. It asks who complains and why? How are complaints from prisoners being dealt with, from a legal and empirical point of view? How do procedures work and can they be considered effective? Should administrative procedures be exhausted before appealing to a judge? It explores whether such systems comply with international regulation, such as the European Prison Rules, the UN Mandela Rules or the case-law of the ECtHR. It speaks to academics, NGOs and lawyers with an interest in prison law, human rights bodies and prison monitoring bodies.