Regional hegemony is a concept in international relations which refers to the influence exercised over neighboring countries by an independently powerful nation, the regional hegemon. The relationship between regional hegemons and the other states within their spheres of influence is analogous to the relationship between a global hegemon and the other states in the international system.
The prominent international relations scholar John Mearsheimer writes extensively about the pursuit of regional hegemony is his book, The Tragedy of Great Power Politics. According to his theory, known as offensive realism, the anarchic nature of the international system, the desire for survival, and the inability to be sure of other states' intentions ultimately lead states to pursue regional hegemony. According to Mearsheimer, global hegemony is an unattainable goal; instead, a state which has achieved the level of regional hegemon will then work to prevent the development of peer competitors in other regions.
Contemporary examples are often politically sensitive or arguable. Often analysis of regional hegemons are based on a specific context or perspective which renders their identification subjective.