This article considers the degree to which the religious beliefs of Jehovah’s Witnesses are given consideration in European and English courts. Adults’ refusal of blood transfusions is examined within the context of European human rights jurisprudence. A focus is also placed on the position of Jehovah’s Witness children who refuse blood transfusions in the specific context of English medical law due to the prevalence of related case law in this jurisdiction. It is argued that the European Court of Human Rights has given appropriate protection to the will-rights of competent adult Jehovah’s Witnesses who refuse blood transfusions. The position of children is somewhat different, and it is suggested that the courts should give greater consideration to the rights of competent children to manifest their religious beliefs.