In this chapter, we will explore Hans Jonas’s contributions to bioethics, emphasising his reflections on the ethical implications of technology for life, medicine, and the environment. We will examine his concerns about genetic engineering, human cloning, and medical experimentation, highlighting the risks of reducing human beings to mere objects. Jonas’s ethics of responsibility serves as a counterpoint to technological utopianism, advocating for precaution and restraint. We will analyse how his critique of meliorism challenges the assumption that technological progress necessarily leads to human improvement. This discussion extends to the redefinition of death, organ transplantation, and euthanasia, underscoring the need for ethical vigilance. Jonas’s work is contextualised within broader debates on applied ethics, particularly in medicine and environmental responsibility. While not explicitly a bioethicist, his ideas have profoundly influenced the field, shaping discussions on the intersection of ethics, technology, and human dignity. His concerns about the human image, freedom, and responsibility remain highly relevant to contemporary bioethical dilemmas. Ultimately, we will position Jonas as a philosopher who, rather than rejecting technology, urges a cautious and morally responsible approach to its applications.