This chapter cites how counterterrorism policies and operations have impacted human rights in liberal democracies. It highlights how detention without trial, torture, and extra-judicial killings impact negatively human rights. Human rights are defined as the fundamental moral rights of a person necessary for a life with human dignity. Additionally, counterterrorism, in the chapter, refers to policies formulated and actions taken to reduce, mitigate, or prevent terrorism. The chapter presents key factors and mechanisms at play through case studies of Northern Ireland in the 1970s and the United States ‘war’ against jihadist terrorism. It also looks at theories of international relations as they relate to how human rights impacts policies for counterterrorism.