ウィリアム・ベイン（William Bain, 1967年 - ）は、イギリスの国際政治学者。国際政治における規範理論、信託統治制度を研究。
南カリフォルニア大学卒業後、ブリティッシュコロンビア大学で修士号および博士号取得。グラスゴー大学講師を経て、現在、アベリストウィス大学国際政治学部講師。
著書 単著 Between Anarchy and Society: Trusteeship and the Obligations of Power, (Oxford University Press, 2003).
編著 The Empire of Security and the Safety of the People, (Routledge, 2006).
論文 "Deconfusing Morgenthau: Moral Inquiry and Classical Realism Reconsidered", Review of International Studies, vol. 26, no. 3 (2000). "The Tyranny of Benevolence?: National Security, Human Security, and the Practice of Statecraft", Global Society, vol. 15, no. 3 (2001). "The Political Theory of Trusteeship and the Twilight of International Equality", International Relations, vol. 16, no. 1 (2003). "In Praise of Folly: International Administration and the Corruption of Humanity", International Affairs, vol. 82, no. 3 (2006). 「秩序と正義の相克──H・ブルの問題設定再考」『思想』993号（2007年） "Are There Any Lessons of History? The English School and the Activity of Being an Historian", International Politics, vol. 44, no. 5 (2007). "One Order, Two Laws: Recovering the 'Normative' in English School Theory", Review of International Studies, vol. 33, no. 4 (2007).
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