Résumé : The present research aimed at examining the possibility that certain social representations of peace and war are, more than others, (in)compatible with support for warfare. It also aimed at investigating the weight of political culture on the realization of this possibility. Using the framework of social representations theory or SRT (Moscovici, 1961/2008), we surveyed undergraduate students from three universities located in two countries, the US and Denmark. Analyses conducted at the cultural and individual levels (Leung, 1989) show that the notions of peace as social transformation and of war as direct and indirect violence tend to be more prevalent among anti-war supporters and Danish participants, and indicate that the values and ideas of peace and war that are most incompatible with support of warfare are equality, fear and poverty. Results are discussed with respect to their theoretical contribution and policy implications.