Cosmopolitanism and empire share a long history together, dating back to Antiquity. We would certainly not know of cosmopolitan idea if political organization such as Empire did not exist, and the imperial form of government certainly would not be so successful if cosmopolitanism was not at least partially involved in the justification and preservation of the series of imperial projects. Interest in the cosmopolitan idea was renewed in the last twenty years with the appearance of globalization theory, but it also appears that empire, whether it is accepted or disputed, also became a popular organizational concept in academic discussions about our current global political situation. In both of those concepts the establishment of peace and its maintenance plays an important role, but is it even possible to distinguish between cosmopolitan and imperial understanding of peace, and how these similarities (and differences) affect the development of today’s global governance?