This article examines the relevant international law relating to informed consent to treatment for individuals with psychosocial disabilities and reflects on the protection offered in this respect by the European Convention on Human Rights (ECHR) and the Council of Europe Convention on Human Rights and Biomedicine. The article argues that while the UN Convention on the Rights of Persons with Disabilities is beginning to influence case law of the European Court of Human Rights, only 'weak' protection has been afforded to people with psychosocial disabilities by the ECHR and the Court in relation to informed consent for medical treatment.