This chapter examines the Optional Protocol to the Convention on the Rights of Persons with Disabilities (CRPD). The Optional Protocol was adopted along with the CRPD on 13 December 2006 by the United Nations General Assembly, and entered into force on 3 May 2008. The Optional Protocol establishes the competence of the Committee on the Rights of the Persons with Disabilities to examine individual complaints with regard to alleged violations of the Convention by states parties to the Optional Protocol, and to undertake inquiries in case of reliable evidence of grave and systematic violations of the Convention. To date, among 175 parties to the Convention, ninety-two states have ratified the Optional Protocol.