This paper proposes visibility as a theological-ethical topos for addressing bioethical questions. Visibility is understood both as a conditio humana—a fundamental dimension of human existence—and as a socio-politically relevant category that structures justice, recognition, agency, and vulnerability. The paper first explores the role of topology in ethical argumentation, tracing its roots from classical rhetorical theory (Aristoteles 2019) to contemporary discourse-linguistic and sociological actualizations. Against this background, visibility is developed as a theological-ethical topos that mediates between invisibility and exposure (Ott 2025a; Ott 2025b). Unlike apodictic proof, which aims at insight into first principles, topical reasoning operates by persuading through premises that are already considered credible and acceptable to interlocutors, thereby establishing a shared justificatory framework (Frank 2017, 11). Topology is therefore highly enriching for transparticular ethical argumentation (Dabrock 2000), as it enables ethical reasoning across divergent moral, cultural, and religious contexts. By introducing topology as a form of ethical argumentation, the paper second explores new ways of engaging with bioethical problems. It demonstrates how visibility functions as a locus communis in medical ethics and how this topos has been taken up and further developed in recent sociological as well as epistemological, philosophical, and theological research.