The main goal of this paper is to present an analysis based on posthumanism of the following dystopian fiction novels: Ishiguro‟s Never Let Me Go, Huxley‟s Brave New World, and Bradbury‟s Fahrenheit 451. The paper is focused on discussing general notions of „humanity‟, „human nature‟, as well as (post)human rights and how our understanding of them can be altered as a result of specific techno-scientific developments. The paper begins with an introduction to posthumanism as a theoretical field, and it further discusses the three main approaches to posthumanism, as well as its relationship with technology and science fiction. The following chapters are based on analyzing the mentioned works of dystopian fiction. The first one discusses notions of humanity and (post)human rights in Kazuo Ishiguro‟s Never Let Me Go. Then, the work continues on to the analysis of Aldous Huxley‟s Brave New World by commenting on techno-scientific developments and how they lead to the creation of a largely dystopian society that is solely focused on work and self-indulgence, bringing their humanity into question. Lastly, an analysis of Ray Bradbury‟s Fahrenheit 451 is also based on discussing the relationship between „the human‟ and technology, as it comments on the repercussions caused by constant exposure to government-run technology, resulting in violation of various human rights, but also the loss of humanity. The final chapter provides a conclusion as it comments on contemporary developments in technology and how they can be connected to the anxieties portrayed by the authors of the previous century.