Book excerpt: This book uses comparative law and comparative international law approaches to explore the role of human rights ombuds, classic-based ombuds and other types of ombuds institutions in human rights protection and promotion, their methods of application of international and domestic human rights law and their roles in strengthening good governance. It highlights the increasing importance of national human rights ombuds institutions globally and their roles as national human rights institutions (NHRIs). Chapters address: ombuds institutions as mechanisms to strengthen democratic, horizontal and vertical accountability, the rule of law and good governance; national human rights ombuds institutions as NHRIs; the investigatory, litigation, promotional and other powers of human rights and classic-based ombuds and their methods for applying international and domestic human rights law; ombuds institutions and the protection and promotion of international children's rights; national human rights ombuds additional mandates as OPCAT national preventive mechanisms, UN Convention on the Rights of Persons with Disabilities Article 33(2) framework mechanisms and EU national equality bodies; human rights ombuds and business and human rights; ombuds institutions, gender and women's rights; the European Ombudsman and human rights; national human rights ombuds and other ombuds models by region, accompanied by case studies on national human rights ombuds; and the legal and extra-legal factors affecting ombuds institutional effectiveness.