ラリー・ジェイ・ダイアモンド（Larry Jay Diamond、1951年10月2日 - ）は、アメリカ合衆国の政治学者。専門は比較政治学、民主主義論、民主化論。
経歴 スタンフォード大学で博士号取得。ヴァンダービルト大学助教授を経て、現在はスタンフォード大学フーバー研究所上級研究員。
イラク連合国暫定当局のアドバイザーをはじめ、アメリカ国務省やアメリカ合衆国国際開発庁といった政府機関、また国際連合や世界銀行などの国際機関による民主化支援にも関わっている。
著書 単著 Class, Ethnicity and Democracy in Nigeria: the Failure of the First Republic, (Syracuse University Press, 1988). Developing Democracy: Toward Consolidation, (Johns Hopkins University Press, 1999). Squandered Victory: the American Occupation and the Bungled Effort to Bring Democracy to Iraq, (Times Books, 2005). The Spirit of Democracy: the Struggle to Build Free Societies throughout the World, (Times Books, 2008). 編著 The Democratic Revolution: Struggles for Freedom and Pluralism in the Developing World, (Freedom House, 1992). Political Culture and Democracy in Developing Countries, (Lynne Rienner, 1993). 共編著 Democracy in Developing Countries, co-edited with Juan J. Linz and Seymour Martin Lipset, (Lynne Rienner, 1988, 2nd ed., 1999). Politics in Developing Countries: Comparing Experiences with Democracy, co-edited with Juan J. Linz and Seymour Martin Lipset, (Lynne Rienner, 1990, 2nd ed., 1995). Reexamining Democracy: Essays in Honor of Seymour Martin Lipset, co-edited with Gary Marks, (Sage, 1992). Capitalism, Socialism, and Democracy Revisited, co-edited with Marc F. Plattner, (Johns Hopkins University Press, 1993). The Global Resurgence of Democracy, co-edited with Marc F. Plattner, (Johns Hopkins University Press, 1993, 2nd ed., 1996). Israeli Democracy under Stress, co-edited with Ehud Sprinzak, (Lynne Rienner, 1993). Nationalism, Ethnic Conflict, and Democracy, co-edited with Marc F. Plattner, (Johns Hopkins University Press, 1994). Economic Reform and Democracy, co-edited with Marc F. Plattner, (Johns Hopkins University Press, 1995). Civil-military Relations and Democracy, co-edited with Marc F. Plattner, (Johns Hopkins University Press, 1996). 中道寿一監訳『シビリアン・コントロールとデモクラシー』（刀水書房, 2006年） Consolidating the Third Wave Democracies, co-edited with , (Johns Hopkins University Press, 1997). Transition without End: Nigerian Politics and Civil Society under Babangida, co-edited with Anthony Kirk-Greene and Oyeleye Oyediran, (Lynne Rienner, 1997). Democracy in East Asia, co-edited with Marc F. Plattner, (Johns Hopkins University Press, 1998). Democratization in Africa, co-edited with Marc F. Plattner, (Johns Hopkins University Press, 1999). The Self-restraining State: Power and Accountability in New Democracies, co-edited with Andreas Schedler and Marc F. Plattner, (Lynne Rienner, 1999). Institutional Reform and Democratic Consolidation in Korea, co-edited with Doh Chull Shin, (Hoover Institution Press, 2000). Consolidating Democracy in South Korea, co-edited with Byung-Kook Kim, (Lynne Rienner, 2000). Elections and Democracy in Greater China, co-edited with Ramon H. Myers, (Oxford University Press, 2001). Political Parties and Democracy, co-edited with Richard Gunther, (Johns Hopkins University Press, 2001). The Global Divergence of Democracies, co-edited with Marc F. Plattner, (Johns Hopkins University Press, 2001). Democracy after Communism, co-edited with Marc F. Plattner, (Johns Hopkins University Press, 2002). Islam and Democracy in the Middle East, co-edited with Marc F. Plattner and Daniel Brumberg, (Johns Hopkins University Press, 2003). Nigeria's Struggle for Democracy and Good Governance: A Festschrift for Oyeleye Oyediran, co-edited with Adigun A.B. Agbaje and Ebere Onwudiwe, (Ibadan University Press, 2004). Assessing the Quality of Democracy, co-edited with Leonardo Morlino, (Johns Hopkins University Press, 2005). World Religions and Democracy, co-edited with Marc F. Plattner and Philip J. Costopoulos, (Johns Hopkins Univ. Press, 2005. Electoral Systems and Democracy, co-edited with Marc F. Plattner, (Johns Hopkins University Press, 2006). The State of India's Democracy, co-edited with Sumit Ganguly and Marc F. Plattner, (Johns Hopkins University Press, 2007). How People View Democracy, co-edited with Marc F. Plattner, (Johns Hopkins University Press, 2008). Latin America's Struggle for Democracy, co-edited with Marc F. Plattner and Diego Abente Brun, (Johns Hopkins University Press, 2008). Political Change in China: Comparisons with Taiwan, co-edited with Bruce Gilley, (Lynne Rienner, 2008).