This Fact Sheet explains the procedures open to individuals who claim to be victims of violations of rights contained in international human rights treaties. It also looks at complaints that are brought under international human rights treaties. Since the early 1970s international complaint mechanisms have developed apace, and individuals can now bring claims to the United Nations concerning violations of their rights contained in the nine so-called “core” human rights treaties. The first chapter describes the typical features of a complaint under any of the nine treaties in general. The second chapter describes the aspects of the individual treaties that deviate from the general norm. The publication also includes various model forms and a user-friendly checklist for the submission of complaints under the nine treaties.