"The war to end war" (sometimes called "The war to end all wars") was a term used to describe World War I. Originally idealistic, it is now used mainly in a disparaging way.

During August 1914, immediately after the outbreak of the war, British author and social commentator H. G. Wells published a number of articles in the London newspapers which subsequently appeared as a book entitled The War That Will End War. Wells blamed the Central Powers for the coming of the war, and argued that only the defeat of German militarism could bring about an end to war. Wells used the shorter form, "the war to end war", in In the Fourth Year (1918), where he noted that the phrase had "got into circulation" in the second half of 1914. In fact, it had become one of the most common catchphrases of the war.

In later years, the term became associated with Woodrow Wilson, despite the fact that Wilson only used it once. Along with the phrase "make the world safe for democracy", it embodied Wilson's conviction that America's entry into the war was necessary to preserve human freedom.

The War may refer to:

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