イアン・ブレマー(Ian Bremmer、1969–) アメリカの政治学者、国際政治アナリスト。政治リスク分析会社ユーラシア・グループの創業者兼社長。地政学リスクを企業経営や投資の意思決定に取り入れる考え方を広め、国際政治と世界経済の関係を分かりやすく解説する著作を数多く発表している。『Gゼロ後の世界』(原題 "Every Nation for Itself: Winners and Losers in a G-Zero World")は、国際社会に世界を主導する国家が存在しない「Gゼロ」の時代を提唱し、新たな国際秩序と地政学リスクを読み解いている。
Ian Bremmer (born 1969) is an American political scientist and international affairs analyst. He is the founder and president of Eurasia Group, a leading political risk consultancy. Widely recognized for bringing geopolitical risk analysis into business and investment decision-making, he has written extensively on global politics and the international economy. His best-known book, "Every Nation for Itself: Winners and Losers in a G-Zero World," introduces the concept of a "G-Zero" world, arguing that the absence of a dominant global leader is reshaping international order and geopolitical risk.