Who won the world war ll who won the l one.

The allies, (Britain, France, US, etc.), won World War I, and, the Allies, again, won World War II, technically, with the main countries being, The United States, The British Empire, The Soviet Union, France, and China.

mainly Britain, France, US won WW1.

May 5, 2005 - Russia and its Western allies in World War II both tend to regard themselves as the country that defeated Hitler.