WO or Wo may refer to:
World War II (often abbreviated to WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945, although related conflicts began earlier.
World War I (WWI or WW1), also known as the First World War, the Great War, or the War to End All Wars, was a global war originating in Europe that lasted from 28 July 1914 to 11 November 1918. More than 70 million military personnel, including 60 million Europeans, were mobilised in one of the largest wars in history.
Thomas Woodrow Wilson (December 28, 1856 – February 3, 1924) was an American politician and academic who served as the 28th President of the United States from 1913 to 1921. A member of the Democratic Party, Wilson served as the President of Princeton University from 1902 to 1910 and as Governor of New Jersey from 1911 to 1913. Wilson's victory in the 1912 presidential election made him the first Southerner elected to the presidency since Zachary Taylor in 1848, and Wilson became a leading force in the Progressive Movement.
Heywood "Woody" Allen (born Allan Stewart Konigsberg; December 1, 1935) is an American director, writer, actor, comedian, playwright, and musician whose career spans more than six decades.
World War III (WWIII or WW3) and Third World War are names given to a hypothetical third worldwide large-scale military conflict subsequent to World War I and World War II.