ロイド・ガードナー（Lloyd C. Gardner、1934年 - ）は、アメリカ合衆国の歴史学者。専門は、アメリカ外交史。ウィスコンシン大学マディソン校でウィリアム・A・ウィリアムズの指導を受け博士号取得。現在、ラトガース大学名誉教授。
著書 単著 Economic Aspects of New Deal Diplomacy, (University of Wisconsin Press, 1964). Architects of Illusion: Men and Ideas in American Foreign Policy, 1941-1949, (Quadrangle Books, 1970). Imperial America: American Foreign Policy since 1898, (Harcourt Brace Jovanovich, 1976). Wilson and Revolutions, 1913-1921, (Lippincott, 1976). A Covenant with Power: America and World Order from Wilson to Reagan, (Macmillan, 1984). Safe for Democracy: the Anglo-American Response to Revolution, 1913-1923, (Oxford University Press, 1984). Approaching Vietnam: from World War II through Dienbienphu, 1941-1954, (W.W. Norton, 1988). Spheres of Influence: the Great Powers Partition Europe, from Munich to Yalta, (I.R. Dee, 1993). Pay Any Price: Lyndon Johnson and the Wars for Vietnam, (I.R. Dee, 1995). Three Kings: The Rise of an American Empire in the Middle East After World War II, (New Press, 2009).
共著 The Origins of the Cold War, with Arthur Schlesinger, Jr., and Hans J. Morgenthau, (Ginn-Blaisdell, 1970). Creation of the American Empire: U.S. Diplomatic History, with Walter F. LaFeber and Thomas J. McCormick, (Rand McNally, 1973). Looking Backward: A Reintroduction to American History, with William L. O'Neill, (McGraw-Hill, 1974).
編著 A Different Frontier: Selected Readings in the Foundation of American Economic Expansion, (Quadrangle Books, 1966). The Korean War, (Quadrangle Books, 1972). American Foreign Policy, Present to Past: A Narrative with Readings and Documents, (Free Press, 1974). Redefining the Past: Essays in Diplomatic History in Honor of William Appleman Williams, (Oregon State University Press, 1986).
共編著 Vietnam: the Early Decisions, co-edited with Ted Gittinger, (University of Texas Press, 1997). International Perspectives on Vietnam, co-edited with Ted Gittinger, (Texas A&M University Press, 2000). America, the Vietnam War, and the World: Comparative and International Perspectives, co-edited with Andreas W. Daum and Wilfried Mausbach, (German Historical Institute, 2003). The Search for Peace in Vietnam, 1964-1968, co-edited with Ted Gittinger, (Texas A&M University Press, 2004). The New American Empire: A 21st Century Teach-In on U.S. Foreign Policy, co-edited with Marilyn B. Young, (New Press, 2005). 松田武・菅英輝・藤本博訳『アメリカ帝国とは何か――21世紀世界秩序の行方』（ミネルヴァ書房、2008年） Iraq and the Lessons of Vietnam, or, How Not to Learn from the Past, co-edited with Marilyn B. Young, (New Press, 2007).
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