Bioethics is a relatively new reflection, which due to its interdisciplinary character is effective at the interface with other areas of knowledge. In its relationship with theology, several questions arise, the main one being: are the interfaces between these two areas relevant? This article works on the relations and interfaces between Public Theology and Bioethics, rescuing the thought of David Tracy who projects a theological reflection that always addresses three audiences, namely, Church, Academy and Society, and for each of these there is a specifi c theological discipline, respectively, Systematic, Fundamental and Practical Theology. This makes possible a renewal of reflection and theological discourse, which expands its private nature and is carried out for a confessional community, becoming effective for a more plural society. In this sense, Public Theology also helps Bioethics built from a theological perspective, enabling it to develop a much more reasonable discourse for a laicized society. It is concluded that the bioethical reflection that occurs in the theological scope establishes intrinsically, aware or not, a dialogue with some characteristics of Public Theology, such as: openness to the sciences, dialogue with society, construction of arguments with reasonability, awareness that operates in a public setting and respects diversity.