Is it possible to communicate ethics across cultural borders? Not according to representatives of “the incommensurability thesis”, who claim that values and norms are culturally bounded. This article argues against this thesis. A first problem is that cultures and traditions are seen as comprehensive, delimited, and exclusive. Normally, however, a culture develops from and is in dialogue with other cultures. Further, the inner diversity of cultures and traditions opens the possibility of communication and shared understandings across cultural borders. Finally, the teaching and discussion of cross-cultural ethics provide practical evidence of the possibility of dialogue and mutual understanding.