World War I was a 1914–1918 global war.

Look up World War One in Wiktionary, the free dictionary.

World War One may also refer to:

• The Seven Years' War (1756–1763), between Great Britain and France, described by Winston Churchill as the "first world war"
• World War One (TV series), a 1964–1965 American documentary television series
• World War One (video game), a 2008 strategy video game, published by Ascaron Entertainment

This disambiguation page lists articles associated with the title World War One.
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