This chapter examines the diversity of international complaints mechanisms available for human rights violations. It covers regional human rights courts, nonjudicial human rights bodies, and various modes of international complaints, highlighting the differences and similarities in their approaches and functions. The chapter discusses the procedural aspects, the criteria for admissibility, and the effectiveness of different complaints mechanisms. It also explores the role of these mechanisms in providing redress for human rights violations and their impact on the development of international human rights law.