ウィリアム・ロジャー・ルイス（William Roger Louis、1936年5月8日 - ）は、アメリカ合衆国の歴史学者。専門は、イギリス帝国史。
ミシガン州デトロイト生まれ。オクラホマ大学卒業。オックスフォード大学セントアントニー校留学を経て、ハーバード大学で博士号取得。エール大学を経て、1970年からテキサス大学オースティン校歴史学部で教鞭をとっている。1993年、イギリス学士院に選出される。1999年、大英帝国勲章を授かる。
著書
- Ruanda-Urundi, 1884-1919, Clarendon Press, 1963.
- Great Britain and Germany's lost colonies, 1914-1919, Clarendon Press, 1967.
- British strategy in the Far East, 1919-1939, Clarendon Press, 1971.
- Imperialism at bay 1941-1945: the United States and the decolonization of the British Empire, Clarendon Press, 1977.
- The British Empire in the Middle East, 1945-1951: Arab nationalism, the United States, and postwar imperialism, Clarendon Press, 1984,
- In the name of God, go!: Leo Amery and the British Empire in the age of Churchill, W. W. Norton, 1992.
- Ends of British imperialism: the scramble for Empire, Suez and decolonization: collected essays, I. B. Tauris, 2006.
編著
- Britain and Germany in Africa: imperial rivalry and colonial rule, edited by Prosser Gifford and Wm. Roger Louis, Yale University Press, 1967.
- E. D. Morel's history of the Congo reform movement, edited by Wm. Roger Louis and Jean Stengers, Clarendon Press, 1968.
- France and Britain in Africa: imperial rivalry and colonial rule, edited by Prosser Gifford and Wm. Roger Louis, Yale University Press, 1971.
- National security and international trusteeship in the Pacific, edited by Wm. Roger Louis, Naval Institute Press, 1972.
- The origins of the Second World War, edited by Wm. Roger Louis, Wiley, 1972.
- Imperialism: the Robinson and Gallagher controversy, edited by Wm. Roger Louis, New Viewpoints, 1976.
- Australia, New Zealand, and the Pacific Islands since the First World War, edited by William S. Livingston and Wm. Roger Louis, University of Texas Press, 1979.
- The Transfer of power in Africa: decolonization, 1940-1960, edited b y Prosser Gifford and Wm. Roger Louis, Yale University Press, 1982.
- The "Special relationship": Anglo-American relations since 1945, edited by Wm. Roger Louis and Hedley Bull, Clarendon Press, 1986.
- The End of the Palestine mandate, edited by Wm. Roger Louis and Robert W. Stookey, University of Texas Press, 1986.
- Decolonization and African independence: the transfers of power, 1960-1980, edited by Prosser Gifford and Wm. Roger Louis, Yale University Press, 1988.
- Musaddiq, Iranian nationalism and oil, edited by James A. Bill and Wm. Roger Louis, Tauris, 1988.
- Suez 1956: the crisis and its consequences, edited by Wm. Roger Louis and Roger Owen, Clarendon Press, 1989.
- The Iraqi revolution of 1958: the old social classes revisited, edit ed by Robert A. Fernea and Wm. Roger Louis, Tauris, 1991.
- Churchill, edited by Robert Blake and Wm. Roger Louis, Oxford University Press, 1993.
- Adventures with Britannia: personalities, politics and culture in Britain, edited by Wm. Roger Louis, I. B. Tauris, 1995.
- The Oxford history of the twentieth century, edited by Michael Howard and Wm. Roger Louis, Oxford University Press, 1998.
- More adventures with Britannia: personalities, politics and culture in Britain, edited by Wm. Roger Louis, University of Texas Press, 1998.
- The Oxford history of the British Empire, vol. 4: The twentieth century, edited by Judith M. Brown and Wm. Roger Louis, Oxford University Press, 1999.
- A revolutionary year: the Middle East in 1958, edited by Wm. Roger Louis and Roger Owen, I. B. Tauris, 2002.
- Still more adventures with Britannia: personalities, politics and culture in Britain, edited by Wm. Roger Louis, I. B. Tauris, 2003.
- Burnt orange Britannia, edited by Wm. Roger Louis. I .B. Tauris, 2005.
- Yet more adventures with Britannia: personalities, politics and culture in Britain, edited by Wm. Roger Louis, I.B. Tauris, 2005.
